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) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 11, 2021
Feb. 10, 2021
Feb. 10, 2021
Jul. 23, 2020
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Temporary Equity And Stockholders Equity [Line Items]                        
Temporary equity preferred stock, shares authorized         1,000,000       1,000,000      
Common stock, shares authorized         180,000,000   180,000,000   180,000,000     180,000,000
Common stock, shares issued   14,000,000 14,000,000   151,236,000   97,709,000   151,236,000     97,709,000
Shares Issued, Price Per Share   $ 1.03 $ 1.03                  
Equity raise of gross proceeds     $ 14,400,000                  
Series F Preferred stock, shares issued         0   1,000   0     1,000
Common stock value       $ 1,000 $ 151,000   $ 98,000   $ 151,000     $ 98,000
Proceeds from Warrant Exercise           $ 15,000,000.0            
Proceeds from the exercise of common stock warrants             $ 1,500,000   $ 16,550,000 $ 0    
Expected term (years)               5 years 6 months 6 years 1 month 6 days 5 years 6 months    
Risk-free interest rate             0.36% 0.69% 0.37%    
Series E Preferred stock, shares authorized         1,000,000       1,000,000      
Conversion of preferred stock into common stock         261       261      
Convertible preferred stock, shares outstanding         0   0   0     0
Compensation expense related to stock options         $ 400,000     $ 800,000 $ 1,300,000 $ 1,500,000    
Total unrecognized compensation expense         $ 400,000     $ 1,400,000 $ 400,000 $ 1,400,000    
Unrecognized share based compensation expense to be recognized over weighted-average period                 1 year 6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Recognized Weighted Average Expected date                 2022-06      
Outstanding stock options, RSUs and warrants excluded from diluted loss per share                 24,600,000 18,500,000    
July 2020 Warrants                        
Temporary Equity And Stockholders Equity [Line Items]                        
Warrant issued       45,000,000                
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                
Common Stock                        
Temporary Equity And Stockholders Equity [Line Items]                        
Other offering expenses   $ 1,100,000                    
Series F Convertible Preferred Stock                        
Temporary Equity And Stockholders Equity [Line Items]                        
Conversion price       $ 0.40                
Series E Convertible Preferred Stock                        
Temporary Equity And Stockholders Equity [Line Items]                        
Temporary equity preferred stock, shares authorized         69,565       69,565      
Series E Preferred stock, shares authorized         69,565       69,565      
Convertible preferred stock, shares issued         0   0   0     0
Preferred stock par value         $ 0.001       $ 0.001      
Series F Convertible Preferred Stock                        
Temporary Equity And Stockholders Equity [Line Items]                        
Temporary equity preferred stock, shares authorized         18,000       18,000      
Convertible preferred stock, Common shares issued upon conversion       2,500                
Series F Preferred stock, shares issued       18,000                
Proceeds from issuance of warrants           2,700,000            
Conversion price       $ 0.40                
Proceeds of common stock and warrants       $ 18,000,000.0                
Warrants issued in connection with debt instruments           $ 2,700,000            
Sale of common stock, shares                 18,000     17,000
Deemed dividend on convertible preferred stock       2,700,000         $ 500,000     $ 14,700,000
Series E Preferred stock, shares authorized         18,000       18,000      
Preferred stock, par value         $ 0.001       $ 0.001      
Convertible preferred stock, shares outstanding         261   882   261     882
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                
Private Placement | Series F Convertible Preferred Stock                        
Temporary Equity And Stockholders Equity [Line Items]                        
Common stock, shares issued         652,500       652,500      
Maximum                        
Temporary Equity And Stockholders Equity [Line Items]                        
Temporary equity preferred stock, shares authorized         1,000,000       1,000,000      
Series E Preferred stock, shares authorized         1,000,000       1,000,000      
2002 Stock Incentive Plan                        
Temporary Equity And Stockholders Equity [Line Items]                        
Common stock authorized for issuance         3,110,000       3,110,000      
Options and restricted stock units outstanding         881,000       881,000      
Options available for future grants         0       0      
2018 Long-Term Incentive Plan                        
Temporary Equity And Stockholders Equity [Line Items]                        
Common Stock Issued Pursuant To Options Exercised                 5,139,000      
Increase in Number of Units Available for Issuance 24,700,000                      
Common stock issued pursuant to options exercised                 5,139,000      
2018 Long-Term Incentive Plan | Common Stock                        
Temporary Equity And Stockholders Equity [Line Items]                        
Common stock authorized for issuance         36,921,000       36,921,000      
Options available for future grants         3,589,000       3,589,000      
Restricted Stock Units (RSUs)                        
Temporary Equity And Stockholders Equity [Line Items]                        
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Granted                 1,400,000      
Cancelled RSU due to non achievement of performance targets                 100,000      
Performance-Based Awards                        
Temporary Equity And Stockholders Equity [Line Items]                        
Compensation expense related to stock options                 $ 0.0     $ 900,000
Phantom Share Units (PSUs)                        
Temporary Equity And Stockholders Equity [Line Items]                        
Shares issued in period         9,900,000              
Stock Appreciation Rights (SARs)                        
Temporary Equity And Stockholders Equity [Line Items]                        
Shares issued in period         700,000