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Stock-Based Compensation - Evergreen provision (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock options          
Number of Options          
Forfeited, nonvested     0   0
2019 Plan          
Number of Options          
Period of automatic increase in shares reserved       10 years  
Percentage of the common shares outstanding (as a percent)       4.00%  
Number of shares added (In shares) 623,708        
2019 Plan | Stock options          
Number of Options          
Vested   28,333 37,151 115,485 194,327
Forfeited, nonvested   48,333   48,333  
Stock Plan 2018 And 2019 Plans          
Unrecognized share-based compensation          
Unrecognized share-based compensation cost   $ 1.5   $ 1.5  
Unrecognized share-based compensation - Weighted average period       2 years 4 months 24 days  
Stock Plan 2018 And 2019 Plans | Stock options          
Number of Options          
Aggregate maximum number of shares of common stock that may be issued   4,115,512   4,115,512  
Maximum | 2019 Plan          
Number of Options          
Aggregate maximum number of shares of common stock that may be issued   6,680,000   6,680,000