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Commitments and Contingencies - Commitments (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 28, 2018
ft²
Commitments and Contingencies            
Monthly base rent for first twelve months $ 38,000          
Monthly base rent for subsequent twelve months 39,544          
Monthly base rent for final months 41,000          
Standby letter of credit received as collateral $ 475,000          
Term 5 years          
Warrants to purchase (in shares) | shares 9,580          
Fair value of warrants included in stockholders equity $ 494,000          
Non-cash rent expense per month 20,000          
Future minimum lease payments under non-cancelable operating lease     $ 230,000 $ 230,000    
Minimum            
Commitments and Contingencies            
Lease expense under non-cancelable operating lease 38,000          
Maximum            
Commitments and Contingencies            
Lease expense under non-cancelable operating lease 41,000          
Letter of credit            
Commitments and Contingencies            
Letter of Credit         $ 475,000  
Letter of credit | Shareholder            
Commitments and Contingencies            
Letter of Credit         $ 122,000  
Letter of credit cancelled   $ 122,000        
General and administrative expense            
Commitments and Contingencies            
Lease expense under non-cancelable operating lease $ 191,000 $ 172,000        
Office lease extension agreement            
Commitments and Contingencies            
Area (in square feet) | ft²           6,311