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Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Number of Shares    
Beginning balance - Outstanding (shares) 830,343  
Granted (shares) 545,450  
Forfeited/Cancelled (shares) (4,187)  
Ending balance - Outstanding (shares) 1,371,606 830,343
Exercisable (shares) 500,625  
Vested or expected to vest (shares) 1,371,606  
Weighted- Average Exercise Price    
Beginning balance - Outstanding (in dollars per share) $ 21.52  
Granted (in dollars per share) 7.57  
Forfeited/Cancelled (in dollars per share) 8.48  
Ending balance - Outstanding (in dollars per share) 16.01 $ 21.52
Exercisable (in dollars per share) 29.27  
Vested or expected to vest (in dollars per share) $ 16.01  
Weighted- Average Remaining Contractual Life (in years)    
Balance - Outstanding 8 years 3 months 29 days 7 years 8 months 15 days
Exercisable 6 years 8 months 19 days  
Vested or expected to vest 8 years 3 months 29 days  
Aggregate Intrinsic Value ($000)    
Balance - Outstanding $ 355 $ 96
Exercisable 37  
Vested and expected to vest $ 355