Annual report pursuant to Section 13 and 15(d)

Redeemable Preferred Stock and Stockholders' Equity - Additional Information (Detail)

v3.21.1
Redeemable Preferred Stock and Stockholders' Equity - Additional Information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 28, 2020
$ / shares
Jul. 23, 2020
USD ($)
$ / shares
shares
Jun. 10, 2020
USD ($)
$ / shares
Nov. 05, 2019
USD ($)
$ / shares
shares
Oct. 29, 2019
USD ($)
$ / shares
shares
Nov. 14, 2018
Day
$ / shares
shares
Nov. 09, 2018
USD ($)
Day
$ / shares
shares
Sep. 27, 2018
USD ($)
$ / shares
Jan. 25, 2018
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Nov. 30, 2019
$ / shares
Oct. 31, 2019
$ / shares
Mar. 06, 2018
USD ($)
$ / shares
Dec. 31, 2017
shares
Temporary Equity And Stockholders Equity [Line Items]                                      
Temporary equity preferred stock, shares authorized                       1,000,000   1,000,000          
Convertible preferred stock, shares issued and sold                       0   70,000          
Temporary equity preferred stock, shares outstanding                       0   70,000          
Preferred stock, shares issued                       1,000   0          
Common stock value | $                       $ 98,000   $ 31,000          
Deemed dividend on convertible preferred stock | $                       $ 17,378,000              
Series F Preferred stock, shares outstanding                       1,000   0          
Common stock, shares issued                       97,708,502   31,439,000          
Common stock, shares outstanding                       97,663,419   31,439,000          
Common stock, shares authorized                       180,000,000   40,000,000          
Share price | $ / shares                                 $ 0.5750    
Net proceeds from issuance of offering and private placement | $         $ 8,200,000                            
Dividend Declared | $                       $ 0   $ 0 $ 0        
Expected term (years)                       5 years 6 months 3 days   5 years 11 months 19 days 5 years 10 months 13 days        
Volatility                       103.00%   85.00% 81.00%        
Risk-free interest rate                       0.37%   2.55% 2.54%        
Change in fair value of warrants | $                       $ (5,850,000)              
Issuance costs for common stock warrants | $                       $ 1,641,000              
Other offering expenses | $     $ 700,000                                
Stock options outstanding                       2,398,000   1,287,000 1,623,000       1,347,000
Stock Options                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Stock options granted                       1,287,000   0          
Stock options cancelled                           124,000          
Stock options outstanding                           308,455          
Stock Options | Employees                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Stock options granted                 360,000                    
Awards valued per share | $ / shares                 $ 2.11                    
Options expiration period                 10 years                    
Options vesting description                       The options vest ratably over the 36-month period, commencing on February 25, 2018              
Share-based compensation arrangement vesting period                 36 months                    
Stock option activity vesting commencement date                 Feb. 25, 2018                    
Restricted Stock Units (RSUs)                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Granted or Issued                       3,117,000   2,432,000 2,836,000        
Restricted Stock Units (RSUs) | Boards                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Stock options granted                       1,197,000   518,132          
Restricted Stock Units (RSUs) | Mike DiTolla                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Stock options granted                     98,738                
2002 Stock Incentive Plan                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Common stock authorized for issuance                       3,110,000              
Common stock issued pursuant to options exercised                       961,982              
Options and restricted stock units outstanding                       1,724,264              
Options available for future grants                       0              
2018 Long-Term Incentive Plan                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Common stock authorized for issuance                       12,221,000              
Options and restricted stock units outstanding                       2,024,000              
Options available for future grants                       439,000              
2018 Long-Term Incentive Plan | Restricted Stock Units (RSUs) | Employees                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Granted or Issued                       2,600,000   1,400,000          
Units are subject to time-based vesting                       355,000   715,000          
Remaining awards vest based on certain Company performance criteria                       710,000   685,000          
Shares Issued AS Part Of Quarter Bonus Program                       1,554,000   175,000          
Deferred Compensation Plan                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Share based payment award, number of shares vested                       714,000              
Share based payment award, number of shares unvested and outstanding                       1,617,000,000              
Original Western Alliance Warrant                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares                                   $ 2.35  
Western Alliance Warrant                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares               $ 2.13                      
Warrants expire date               Sep. 27, 2028                      
SWK Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Share price | $ / shares                       $ 0.39198              
Exercise price of warrants | $ / shares             $ 1.34     $ 0.39198   $ 1.00       $ 1.00      
Change in fair value of warrants | $             $ 400,000     $ 100,000                  
Warrants issued to purchase shares of common stock             372,023     487,198                  
Number of trading days of average closing price of common stock | Day             10                        
Warrants expire date             Nov. 09, 2026                        
Additional Warrants issued to purchase shares of common stock                   63,779   63,779              
DPG Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares           $ 1.34                          
Warrants issued to purchase shares of common stock           279,851                          
Number of trading days of average closing price of common stock | Day           10                          
Warrants expire date           Nov. 09, 2026                          
SWK Warrants and DPG Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Warrants issued to purchase shares of common stock                       149,727   149,727          
Weighted average exercise price of warrants | $ / shares                       $ 2.17   $ 2.17          
Convertible Preferred Stock                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Common stock, shares issued                       97,709,000   31,439,000 21,072,000       20,468,000
Sale of common stock, shares                       10,800,000   8,993,000          
June 2020 Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Proceeds of common stock and warrants | $                       $ 6,200,000              
Exercise price of warrants | $ / shares                       $ 0.42              
Expected term (years)                       5 years              
Closing price of common stock | $ / shares                       $ 0.54              
Volatility                       109.80%              
Risk-free interest rate                       0.45%              
Dividend yield                       0.00%              
Allocation to preferred stock and warrants before issuance costs | $                       $ 3,000,000              
Allocation to common stock and warrants before issuance costs | $                       $ 3,900,000              
Maximum                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Temporary equity preferred stock, shares authorized                       1,000,000              
Maximum | Original Western Alliance Warrant                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Warrants issued to purchase shares of common stock equal value | $                                   $ 120,000  
Maximum | Western Alliance Warrant                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Warrants issued to purchase shares of common stock equal value | $               $ 120,000                      
Maximum | SWK Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares                       $ 0.8767              
Maximum | DPG Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares                       1.4197              
Minimum | SWK Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares                       1.34              
Minimum | DPG Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares                       $ 2.17              
Series E Convertible Preferred Stock                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Temporary equity preferred stock, shares authorized                       69,565              
Temporary equity numbers of shares sold                           69,565          
Conversion Of Preferred Stock Into Common Stock                           6,956,500          
Temporary equity net proceeds from conversion to common stock | $                           $ 4,000,000          
Convertible preferred stock, shares issued and sold                       0   69,565          
Temporary equity preferred stock, shares outstanding                       0   69,565          
Convertible preferred stock, shares issued upon conversion         100                 100          
Convertible preferred stock, conversion price per share | $ / shares         $ 0.5750                            
Series F Preferred Stock                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Temporary equity preferred stock, shares authorized                       18,000              
Preferred stock, shares issued   18,000                                  
Common stock value | $                       $ 1,000              
Conversion price | $ / shares                       $ 0.40              
Proceeds from issuance of equity securities | $                       $ 18,000,000              
Broker fees and related expenses | $                       1,900,000              
Proceeds of common stock and warrants | $   $ 18,000,000                                  
Proceeds from issuance of warrants | $                       2,700,000              
Proceeds allocated to the warrants based upon fair values | $                       $ 2,700,000              
Series F Preferred stock, shares outstanding                       882,000              
Allocation to preferred stock and warrants before issuance costs | $                       $ 2,700,000              
Series F Preferred Stock | Rights Offering                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Proceeds allocated to the warrants based upon fair values | $   $ 2,700,000                                  
Sale of common stock, shares   18,000                                  
July 2020 Warrants                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Warrant issued   45,000,000                                  
Equity, Fair Value Adjustment | $                       9,500,000              
Change in fair value of warrants | $                       (5,800,000)              
Allocation to preferred stock and warrants before issuance costs | $                       15,300,000              
Issuance costs for common stock warrants | $                       1,600,000              
July 2020 Warrants | Rights Offering                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Warrant issued   45,000,000                                  
Allocated to the warrants based upon fair values | $   $ 15,300,000                                  
Exercise price of warrants | $ / shares   $ 0.40                                  
Series F Convertible Preferred Stock and July 2020 Warrants | Rights Offering                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Deemed dividend on convertible preferred stock | $                       $ 14,700,000              
Exercise price of warrants | $ / shares                       $ 0.34              
Expected term (years)                       5 years              
Closing price of common stock | $ / shares                       $ 0.44              
Volatility                       109.80%              
Risk-free interest rate                       0.27%              
Dividend yield                       0.00%              
Series F Preferred Stock and July Two Thousand Twenty Amendment                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Exercise price of warrants | $ / shares $ 0.21                                    
Expected term (years) 5 years                                    
Closing price of common stock | $ / shares $ 0.28                                    
Volatility 109.50%                                    
Risk-free interest rate 0.26%                                    
Dividend yield 0.00%                                    
Private Placement                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Gross proceeds from issuance of convertible preferred stock | $         $ 4,000,000                            
Private Placement | Series E Convertible Preferred Stock                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Temporary equity numbers of shares sold                         69,565            
Conversion Of Preferred Stock Into Common Stock                       6,956,500              
Temporary equity net proceeds from conversion to common stock | $                       $ 4,000,000              
Convertible preferred stock, shares issued and sold         69,565                            
Common stock, shares issued                       2,205,000              
Share price | $ / shares         $ 57.50                 $ 57.50          
Convertible preferred stock, shares issued upon conversion                       882              
Public Offering                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Proceeds from issuance of common stock | $         $ 4,200,000                            
Warrant expiration date     Jun. 10, 2025                                
Proceeds from offering | $     $ 6,900,000                                
Combined purchase price of share and warrant | $ / shares     $ 0.64                                
Public Offering | Convertible Preferred Stock                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Sale of common stock, shares         7,820,000                            
Share price | $ / shares         $ 0.5750                            
Over-Allotment Option                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Proceeds from issuance of equity securities | $       $ 600,000                              
Sale of common stock, shares       1,173,000                              
Share price | $ / shares       $ 0.5750                              
Over-Allotment Option | Maximum                                      
Temporary Equity And Stockholders Equity [Line Items]                                      
Option to purchase additional common stock granted         1,173,000