Quarterly report pursuant to Section 13 or 15(d)

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

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Redeemable Preferred Stock and Stockholders' Equity - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 23, 2020
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$ / shares
shares
Nov. 14, 2018
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Customer
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Nov. 09, 2018
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Customer
$ / shares
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Sep. 27, 2018
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$ / shares
Mar. 06, 2018
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Sep. 30, 2020
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Aug. 31, 2020
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Mar. 31, 2020
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Mar. 31, 2022
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$ / shares
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Mar. 31, 2021
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$ / shares
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Jun. 30, 2020
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Dec. 31, 2021
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$ / shares
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Dec. 31, 2020
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Feb. 28, 2021
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Nov. 30, 2019
$ / shares
May 31, 2019
$ / shares
shares
Temporary Equity And Stockholders Equity [Line Items]                                
Temporary equity preferred stock, shares authorized                 1,000,000              
Common stock, shares authorized                 180,000,000     180,000,000        
Common stock, shares issued                 6,176,000     6,174,000        
Series F Preferred stock, shares issued                 0     0        
Common stock value | $                 $ 155,000     $ 154,000        
Expected term (years)                 6 years 1 month 6 days            
Risk-free interest rate                 0.00% 0.69%            
Series G Preferred stock, shares authorized                 1,000,000              
Conversion of preferred stock into common stock                   268            
Common stock authorized for issuance                 41,000,000              
Compensation expense related to stock options | $                 $ 200,000 $ 900,000            
Total unrecognized compensation expense | $                 800,000 700,000            
Accrued liabilities | $                 6,027,000     8,276,000   $ 600,000    
Other liabilities | $                 $ 387,000     $ 330,000        
Unrecognized share based compensation expense to be recognized over weighted-average period                 1 year 4 months 24 days              
Allocated Share-based Compensation Expense | $                 $ 209,000 $ 928,000            
Outstanding stock options, RSUs and warrants excluded from diluted loss per share                 900,000 2,700,000            
Warrants adjusted exercise price | $ / shares                     $ 15.00          
July 2020 Warrants                                
Temporary Equity And Stockholders Equity [Line Items]                                
Proceeds from issuance of warrants | $                 $ 15,300,000              
Warrants issued in connection with debt instruments | $                 15,300,000              
July 2020 Warrants | Rights Offering                                
Temporary Equity And Stockholders Equity [Line Items]                                
Allocated to the warrants based upon fair values | $ $ 15,300,000                              
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      
Series F Convertible Preferred Stock                                
Temporary Equity And Stockholders Equity [Line Items]                                
Temporary equity preferred stock, shares authorized 18,000,000                              
Conversion price | $ / shares $ 10.00                              
Series G Preferred stock, shares authorized 18,000,000                              
Options and restricted stock units outstanding                       251,000        
Series F Convertible Preferred Stock                                
Temporary Equity And Stockholders Equity [Line Items]                                
Temporary equity preferred stock, shares authorized                   18,000            
Common stock value | $ $ 1,000,000                              
Proceeds from issuance of warrants | $                 2,700,000              
Proceeds of common stock and warrants | $ 18,000,000.0                              
Warrants issued in connection with debt instruments | $                 2,700,000              
Deemed dividend on convertible preferred stock | $ 2,700,000               $ 200,000     $ 500,000        
Series G Preferred stock, shares authorized                   18,000            
Preferred stock, par value | $ / shares                   $ 0.001            
Convertible preferred stock, shares outstanding                 0              
Series F Convertible Preferred Stock | Rights Offering                                
Temporary Equity And Stockholders Equity [Line Items]                                
Proceeds allocated to the warrants based upon fair values | $ $ 2,700,000                              
Series G Redeemable Preferred Stock                                
Temporary Equity And Stockholders Equity [Line Items]                                
Temporary equity preferred stock, shares authorized                 180,000     180,000        
Series G Preferred stock, shares authorized                 180,000     180,000        
Preferred stock, par value | $ / shares                 $ 0.001     $ 0.001        
Convertible preferred stock, shares issued                 154,000     154,000        
Convertible preferred stock, shares outstanding                 154,000     154,000        
Private Placement | Series F Convertible Preferred Stock                                
Temporary Equity And Stockholders Equity [Line Items]                                
Common stock, shares issued                   670,000            
Maximum                                
Temporary Equity And Stockholders Equity [Line Items]                                
Temporary equity preferred stock, shares authorized                 1,000,000              
Series G Preferred stock, shares authorized                 1,000,000              
2002 Stock Incentive Plan                                
Temporary Equity And Stockholders Equity [Line Items]                                
Common stock authorized for issuance                 124,400,000              
Options available for future grants                 0              
2018 Long-Term Incentive Plan                                
Temporary Equity And Stockholders Equity [Line Items]                                
Common stock authorized for issuance                 971,000,000              
Options and restricted stock units outstanding                 200,000,000              
2018 Long-Term Incentive Plan | Common Stock                                
Temporary Equity And Stockholders Equity [Line Items]                                
Common stock authorized for issuance                 1,500,000              
Options available for future grants                 85,000,000              
Restricted Stock Units (RSUs)                                
Temporary Equity And Stockholders Equity [Line Items]                                
Options and restricted stock units outstanding                 24,000,000              
Performance-Based Awards                                
Temporary Equity And Stockholders Equity [Line Items]                                
Allocated Share-based Compensation Expense | $                 $ 0     $ 0        
Phantom Share Units (PSUs)                                
Temporary Equity And Stockholders Equity [Line Items]                                
Other liabilities | $                 300,000     $ 300,000        
Allocated Share-based Compensation Expense | $                 $ 100,000              
Shares issued in period                 11,000     400,000        
Stock Appreciation Rights (SARs)                                
Temporary Equity And Stockholders Equity [Line Items]                                
Accrued liabilities | $                 $ 500,000     $ 300,000        
Allocated Share-based Compensation Expense | $                 $ 200,000              
Shares issued in period                       40,000        
Original Western Alliance Warrant                                
Temporary Equity And Stockholders Equity [Line Items]                                
Conversion price | $ / shares         $ 58.75                      
Weighted average exercise price of warrants | $ / shares       $ 53.25                        
Warrants expire date       Sep. 27, 2028                        
Original Western Alliance Warrant | Maximum                                
Temporary Equity And Stockholders Equity [Line Items]                                
Warrants issued to purchase shares of common stock equal value | $       $ 120,000,000 $ 120,000                      
SWK Warrants                                
Temporary Equity And Stockholders Equity [Line Items]                                
Warrant issued     14,881,000                          
Weighted average exercise price of warrants | $ / shares     $ 33.50         $ 9.75             $ 25.00  
Change in fair value of warrants | $     $ 400,000         $ 100,000                
Warrants expire date     Nov. 09, 2026                          
Warrants adjusted exercise price | $ / shares     $ 9.75                          
Warrant issued               19,488,000                
Number Of Trading Days | Customer     10                          
Warrants Fair Value Assumptions Expected Term     8 years                          
Warrants fair value assumptions, expected volatility rate     81.79%                          
Warrants fair value assumptions annual dividend per share | $ / shares     $ 0.00                          
Warrants fair value assumptions, risk-free interest rate     3.13%                          
Warrants adjusted strike price | $ / shares               $ 12.25                
Additional Warrants issued to purchase shares of common stock               2,551,000                
SWK Warrants | Maximum                                
Temporary Equity And Stockholders Equity [Line Items]                                
Weighted average exercise price of warrants | $ / shares                 $ 22.00              
SWK Warrants | Minimum                                
Temporary Equity And Stockholders Equity [Line Items]                                
Weighted average exercise price of warrants | $ / shares                 $ 33.50              
DPG Warrants                                
Temporary Equity And Stockholders Equity [Line Items]                                
Warrant issued                               5,989,000
Weighted average exercise price of warrants | $ / shares   $ 33.50                           $ 54.25
Expected term (years)                 5 years              
Change in fair value of warrants | $   $ 300,000                            
Warrants expire date   Nov. 09, 2026                            
Warrant issued   11,194                            
Number Of Trading Days | Customer   10                            
Warrants Fair Value Assumptions Expected Term   8 years                            
Warrants fair value assumptions, expected volatility rate   8179.00%                            
Warrants fair value assumptions annual dividend per share | $ / shares   $ 0.00                            
Warrants fair value assumptions, risk-free interest rate   313.00%                            
Finder's fee | $     $ 400,000                          
Adjusted exercise price of warrants | $ / shares           $ 15.50 $ 9.50                  
DPG Warrants | Maximum                                
Temporary Equity And Stockholders Equity [Line Items]                                
Weighted average exercise price of warrants | $ / shares                 $ 35.50              
DPG Warrants | Minimum                                
Temporary Equity And Stockholders Equity [Line Items]                                
Weighted average exercise price of warrants | $ / shares                 $ 54.25              
June 2020 Warrants                                
Temporary Equity And Stockholders Equity [Line Items]                                
Common stock, shares issued 100,000                              
June 2020 Warrants | Series F Convertible Preferred Stock and July 2020 Warrants                                
Temporary Equity And Stockholders Equity [Line Items]                                
Warrant issued 1,800,000,000