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Share-Based Compensation - Additional Information (Details)
1 Months Ended 12 Months Ended
Jun. 22, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Sep. 24, 2018
$ / shares
shares
Nov. 30, 2020
USD ($)
shares
Oct. 31, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jan. 31, 2019
employee
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Apr. 22, 2020
$ / shares
Aug. 03, 2018
shares
Dec. 03, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Warrants outstanding | shares     8,000,000         900,000 8,995,906      
Share-based payments expense | $               $ 12,000,000.0 $ 9,100,000      
Unrecognized compensation expense related to non-vested share options | $               5,800,000        
Total fair value of vested shares | $               11,800,000 8,500,000      
Total instrinsic value of shares exercised | $               $ 2,400,000 0      
Weighted average exercise price of warrants | $ / shares     $ 5.375         $ 3.06   $ 0.5869    
Weighted average remaining life of warrants               1 year 6 months 7 days        
Percentage of premium on exercise price     25.00%                  
Closing market price | $ / shares     $ 4.30                  
Proceeds from issuance of shares, stock options and warrant | $               $ 191,440,000 $ 2,821,000      
Weighted average period for recognition related to non-vested stock options               1 year 2 months 12 days        
2010 Stock Incentive Plan ("the Plan")                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares authorized for issuance | shares                     56,800,000 31,500,000
Number of options available for issuance | shares               24,700,000        
Restricted shares granted | shares       100,000                
Amount of grant date fair value of the restricted shares | $       $ 100,000                
Restricted Stock                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options outstanding to purchase shares of common stock | shares               100,000        
Restricted shares granted | shares               70,000        
Restricted shares vested | shares               70,000        
Unrecognized compensation cost related to unvested restricted shares | $               $ 0        
Restricted Stock | 2010 Stock Incentive Plan ("the Plan")                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of employees | employee             3          
Options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options outstanding to purchase shares of common stock | shares               25,087,416 14,936,726      
Cash received from options exercised | $               $ 1,700,000 $ 0      
$5.0 million YA II PN*                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Warrants exercised | shares 1,700,000 1,000,000.0                    
Proceeds from issuance of shares, stock options and warrant | $ $ 2,500,000 $ 1,000,000.0                    
Warrants, ID Venturas                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Warrants exercised | shares         1,000,000.0 5,300,000            
Proceeds from issuance of shares, stock options and warrant | $         $ 600,000 $ 3,100,000