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Stockholders' Equity - Stock Options (Details) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Jan. 01, 2020
Sep. 08, 2017
2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period   10 years    
Options to purchase common stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage increase of authorized shares     4.00%  
Annual additional options authorized (in shares) 167,457 160,910    
Options to purchase common stock | 2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum shares authorized (in shares)       400,000
Award vesting period   4 years    
Expiration period   10 years