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Commitments and Contingencies - Commitments (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 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     40,000            
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   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         $ 119,000 $ 119,000      
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 $ 230,000 $ 382,000 $ 402,000          
Office lease extension agreement                  
Commitments and Contingencies                  
Area (in square feet) | ft²                 6,311