Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Options Outstanding (Details)

v3.20.2
Stockholders' Equity - Options Outstanding (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Number of Shares    
Balance at the beginning of the period (in shares) 7,568,304  
Granted (in shares) 742,824  
Forfeited/Cancelled (in shares) (264,750)  
Balance at the end of the period (in shares) 8,046,378 7,568,304
Vested or expected to vest at the end of the period (in shares) 8,046,378  
Exercisable at the end of the period (in shares) 5,176,228  
Weighted-Average Exercise Price    
Balance at the beginning of the period (in dollars per share) $ 3.40  
Granted (in dollars per share) 0.97  
Forfeited/Cancelled (in dollars per share) (3.39)  
Balance at the end of the period (in dollars per share) 3.18 $ 3.40
Vested or expected to vest at the end of the period (in dollars per share) 3.18  
Exercisable at the end of the period (in dollars per share) $ 4.04  
Weighted Average Remaining Contractual Term    
Options Outstanding at the end of the period 6 years 11 months 8 days 7 years 3 days
Vested or expected to vest at the end of the period 6 years 11 months 8 days  
Exercisable at the end of the period 6 years 21 days