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Stockholders’ Equity and Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Shares of Stock under Stock Options      
Beginning balance (shares) 1,743,000    
Granted (shares) 1,148,000    
Exercised (shares) 0    
Canceled (shares) (131,000)    
Ending balance (shares) 2,760,000   1,743,000
Vested and exercisable (shares) 883,000    
Weighted- Average Exercise Price      
Beginning balance (USD per share) $ 5.73    
Granted (USD per share) 1.04    
Exercised (USD per share) 0.00    
Canceled (USD per share) 5.57    
Ending balance (USD per share) 3.78   $ 5.73
Vested and exercisable (USD per share) $ 6.03    
Weighted- Average Remaining Contractual Term      
Outstanding 8 years 10 months 9 days   8 years 2 months 12 days
Vested and exercisable 7 years 9 months 14 days    
Aggregate Intrinsic Value      
Beginning balance $ 4,356    
Exercised 0    
Ending balance 33   $ 4,356
Vested and exercisable $ 0    
Weighted-average grant date fair value (USD per share) $ 1.04 $ 2.42