Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Stock Option Activity (Details)

v3.21.1
Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Beginning balance - Outstanding (shares) 526,070  
Granted (shares) 349,437  
Exercised (shares) (166)  
Forfeited/expired (shares) (44,998)  
Ending balance - Outstanding (shares) 830,343 526,070
Exercisable (shares) 447,802  
Vested or expected to vest (shares) 830,343  
Weighted- Average Exercise Price    
Beginning balance - Outstanding (in dollars per share) $ 30.55  
Granted (in dollars per share) 8.17  
Exercised (in dollars per share) 8.60  
Forfeited/expired (in dollars per share) 23.50  
Ending balance - Outstanding (in dollars per share) 21.52 $ 30.55
Exercisable (in dollars per share) 31.47  
Vested or expected to vest (in dollars per share) $ 21.52  
Weighted- Average Remaining Contractual Life (in years)    
Balance - Outstanding 7 years 8 months 15 days 7 years 7 months 13 days
Exercisable 6 years 8 months 26 days  
Vested or expected to vest 7 years 8 months 15 days  
Aggregate Intrinsic Value ($000)    
Balance - Outstanding $ 96 $ 60
Exercisable 22  
Vested and expected to vest $ 96