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Stockholders' Equity - Additional information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Nov. 04, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized stock repurchase amount       $ 25,000,000
Treasury stock, shares acquired (in shares) 3,202,690      
Treasury stock, weighted average price (in dollars per share) $ 3.72      
Treasury stock, amount repurchased $ 11,900,000      
Stock option exercises (in shares) 155,690      
Proceeds from exercise of stock options $ 611,000 $ 2,761,000    
Stock option exercisable (in shares) 4,153,242      
Unrecognized compensation cost related to non-vested share-based compensation awards granted $ 9,300,000      
Warrants outstanding (in shares) 2,051,033      
Warrants fair value $ 4,500,000      
Employees And Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 3,192,505      
Fair market value of shares granted $ 12,900,000      
Term of options granted period 10 years      
Vesting period of shares 3 years      
Stock option exercises (in shares) 155,690 1,159,347    
Proceeds from exercise of stock options $ 500,000 $ 2,800,000    
Intrinsic value of options exercised $ 100,000 $ 3,100,000    
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrant exercise price (in dollars per share) $ 2.38      
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrant exercise price (in dollars per share) $ 3.42      
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 278,369      
Fair market value of RSUs granted $ 1,100,000      
Restricted Stock Units (RSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of shares 1 year      
Restricted Stock Units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of shares 3 years      
Preferred Stock Series B        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred Stock, shares outstanding (in shares) 443   443