Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Option Activity (Details)

v3.20.1
Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Number of Shares    
Beginning balance - Outstanding (shares) 5,261,860  
Granted (shares) 2,563,400  
Exercised (shares) 0  
Forfeited/Cancelled(shares) (140,498)  
Ending balance - Outstanding (shares) 7,684,762 5,261,860
Exercisable (shares) 3,326,023  
Vested or expected to vest (shares) 7,684,762  
Weighted- Average Exercise Price    
Beginning balance - Outstanding (in dollars per share) $ 3.06  
Granted (in dollars per share) 0.86  
Exercised (in dollars per share) 0  
Forfeited/Cancelled (in dollars per share) 1.80  
Ending balance - Outstanding (in dollars per share) 2.35 $ 3.06
Exercisable (in dollars per share) 3.89  
Vested or expected to vest (in dollars per share) $ 2.35  
Weighted- Average Remaining Contractual Life (in years)    
Balance - Outstanding 8 years 1 month 9 days 7 years 7 months 13 days
Exercisable 6 years 7 months 17 days  
Vested or expected to vest 8 years 1 month 9 days  
Aggregate Intrinsic Value ($000)    
Balance - Outstanding $ 28 $ 60
Exercisable 23  
Vested and expected to vest $ 28