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Stockholders' Equity (Detail)
12 Months Ended
Jun. 22, 2020
shares
May 20, 2020
$ / shares
Jun. 04, 2018
$ / shares
shares
Dec. 31, 2020
vote
class
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class of Stock [Line Items]          
Total stock dividend authorized to issue (in shares)       300,000,000  
Number of classes of stock | class       3  
Preferred stock, shares authorized (in shares)       100,000,000  
Preferred shares outstanding (in shares)       0  
Classes of preferred stock | class       1  
Common stock, shares, issued (in shares)       20,552,209  
Common stock, shares, outstanding (in shares)       20,377,987  
Exercisable price of warrants to purchase common stock (price per share) | $ / shares   $ 0.001      
Ownership percentage, individual   10.00%      
Ownership percentage, investor   20.00%      
Class A Common Stock          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares)       100,000,000 100,000,000
Number of votes for each share | vote       1  
Common stock, shares, issued (in shares)       18,135,956 15,750,097
Common stock, shares, outstanding (in shares)       17,961,734 15,681,439
Common stock, par value (usd per share) | $ / shares   $ 0.0000001   $ 0.0000001 $ 0.0000001
Ownership percentage, individual   50.00%      
Ownership percentage, investor   20.00%      
Rights to purchase shares, portion of share   0.01      
Sale of stock (usd per share) | $ / shares   $ 25.00      
Class B Common Stock          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares)       100,000,000 100,000,000
Number of votes for each share | vote       1  
Common stock, shares, issued (in shares)       2,416,253 1,926,848
Common stock, shares, outstanding (in shares)       2,416,253 1,926,848
Common stock, par value (usd per share) | $ / shares   $ 0.0000001   $ 0.0000001 $ 0.0000001
Rights to purchase shares, portion of share   0.01      
Sale of stock (usd per share) | $ / shares   $ 25.00      
Series 1 Warrants          
Class of Stock [Line Items]          
Number of warrants issued (shares)     3,016,853    
Number of securities called by each warrant (in shares)     1    
Exercisable price of warrants to purchase common stock (price per share) | $ / shares     $ 0.0000001    
Rights to purchase shares, portion of share   0.01      
Sale of stock (usd per share) | $ / shares   $ 25.00      
Series 2 warrants          
Class of Stock [Line Items]          
Number of warrants issued (shares) 22,154   712,736    
Number of securities called by each warrant (in shares)     1    
Exercisable price of warrants to purchase common stock (price per share) | $ / shares     $ 0.0000001    
Rights to purchase shares, portion of share   0.01      
Sale of stock (usd per share) | $ / shares   $ 25.00      
Class A Right          
Class of Stock [Line Items]          
Conversion ratio   1      
Class B Right          
Class of Stock [Line Items]          
Conversion ratio   1      
Series 1 Warrant Right          
Class of Stock [Line Items]          
Conversion ratio   1      
Series 2 Warrant Right          
Class of Stock [Line Items]          
Conversion ratio   1