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Stockholders' Equity - Stock Options (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
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) 107,452 167,457    
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