Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Details)

v3.20.2
Stock-based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 15, 2020
May 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares exercised         366,732    
Unamortized stock-based compensation cost related to unvested stock options     $ 3,547   $ 3,547    
Unamortized stock-based compensation cost, weighted average period of recognition         3 years    
Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares, Unvested     2,577,375   2,577,375    
Stock issued during period     676,500 0 2,692,000 0  
2019 Equity Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares available to be issued     2,967,576   2,967,576    
Increase in common stock reserved for future issuance   3,000,000          
Increase In common stock reserved for issuance of number of shares of capital stock outstanding     1,021,861   1,021,861    
2019 Employee Stock Purchase Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares available to be issued     408,453   408,453    
Common stock, number of shares available for sale     541,379   541,379    
Period in which reserved shares will increase annually         10 years    
Increase in common stock reserved for issuance as a percentage of total number of shares of capital stock outstanding on the last day of the prior calendar year     1.00%   1.00%    
Increase In common stock reserved for issuance of number of shares of capital stock outstanding on last day of prior calendar year     500,000   500,000    
Increase In common stock reserved for issuance of number of shares of capital stock outstanding     204,372   204,372    
Common stock reserved for issuance description         Additionally, the number of shares of common stock reserved for issuance under the 2019 Employee Stock Purchase Plan automatically increases on January 1 of each calendar year for 10 years, starting January 1, 2020, and ending on, and including, January 1, 2029, in an amount equal to the lesser of 1% of the total number of shares of capital stock outstanding on December 31st of the prior calendar year, and (ii) 500,000 shares, unless the Board of Directors or the compensation committee of the Board of Directors determines prior to such date that there will be a lesser increase, or no increase.    
Number of shares issued 64,320            
2012 Equity Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Expiration period         10 years    
Number of shares exercised         0   0
2012 Equity Incentive Plan | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period         2 years    
2012 Equity Incentive Plan | Maximum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period         4 years    
2012 Equity Incentive Plan | Options and SARs | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Exercise price options granted from fair value common stock, percent         100.00%    
2012 Equity Incentive Plan | Granted to Ten Percent Stockholders | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Exercise price options granted from fair value common stock, percent         110.00%    
2012 Equity Incentive Plan | Granted to Ten Percent Stockholders | Maximum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period         5 years    
2019 Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, number of shares available for sale     5,906,900   5,906,900    
Period in which reserved shares will increase annually         10 years    
Increase in common stock reserved for issuance as a percentage of total number of shares of capital stock outstanding on the last day of the prior calendar year     5.00%   5.00%    
Common stock reserved for issuance description         5,906,900 shares of common stock are reserved for future issuance under the 2019 Option Plan, plus the number of shares subject to outstanding stock options or other stock awards that were granted under the 2012 Option Plan that are forfeited, terminated, expire or are otherwise not issued. Additionally, the number of shares of common stock reserved for issuance under the 2019 Option Plan automatically increases on January 1 of each calendar year for 10 years, starting January 1, 2020 and ending on and including January 1, 2029, in an amount equal to 5% of the total number of shares of capital stock outstanding on December 31 of the prior calendar year, unless the Board of Directors or compensation committee determines prior to the date of increase that there will be a lesser increase, or no increase.