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Stockholders’ Equity and Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Shares of Stock under Stock Options          
Beginning balance (in shares)     1,743,000    
Granted (in shares) 2,659,000 29,800 4,250,000 706,640  
Exercised (in shares)     0    
Canceled (in shares)     (662,000)    
Ending balance (in shares) 5,331,000   5,331,000   1,743,000
Vested and exercisable (in shares) 1,119,000   1,119,000    
Weighted- Average Exercise Price          
Beginning balance (in USD per share)     $ 5.73    
Granted (in USD per share) $ 0.55 $ 2.33 0.67 $ 3.82  
Exercised (in USD per share)     0    
Canceled (in USD per share)     3.52    
Ending balance (in USD per share) 1.97   1.97   $ 5.73
Vested and exercisable (in USD per share) $ 5.10   $ 5.10    
Weighted- Average Remaining Contractual Term          
Outstanding (in years)     8 years 11 months 15 days   8 years 2 months 12 days
Vested and exercisable (in years)     7 years 3 months 21 days    
Aggregate Intrinsic Value          
Beginning balance     $ 4    
Exercised     0    
Ending balance $ 353   353   $ 4
Vested and exercisable $ 0   $ 0    
Weighted-average grant date fair value (in USD per share) $ 0.35 $ 1.42 $ 0.43 $ 2.19