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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 20, 2019
Jun. 30, 2020
May 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Subsidiary Sale Of Stock [Line Items]                
Unregistered common stock exchanged for consulting services           $ 197   $ 197
Compensation expense       $ 2,812 $ 2,681   $ 5,491 4,915
Shareholder Consulting Agreement [Member]                
Subsidiary Sale Of Stock [Line Items]                
Number of shares of unregistered common stock exchanged for consulting services 10,195              
Price per share $ 19.37              
Consulting services performance period 6 months              
Prepaid consulting services         197     197
General and Administrative [Member]                
Subsidiary Sale Of Stock [Line Items]                
Compensation expense       $ 1,142 1,355   $ 2,212 2,507
General and Administrative [Member] | Shareholder Consulting Agreement [Member]                
Subsidiary Sale Of Stock [Line Items]                
Compensation expense         $ 99     $ 99
Additional Paid-In Capital [Member]                
Subsidiary Sale Of Stock [Line Items]                
Unregistered common stock exchanged for consulting services           $ 197    
Common Stock [Member]                
Subsidiary Sale Of Stock [Line Items]                
Restricted stock units vested shares       119,834 74,166      
Number of shares of unregistered common stock exchanged for consulting services           10,195    
Common Stock [Member] | Director [Member]                
Subsidiary Sale Of Stock [Line Items]                
Restricted stock units vested shares   24,000            
Common Stock [Member] | Executive Officers [Member]                
Subsidiary Sale Of Stock [Line Items]                
Restricted stock units vested shares     74,166 95,834