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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, 2022
Dec. 31, 2021
Options Outstanding    
Outstanding at beginning of period (in shares) 4,215,643  
Granted (in shares) 233,600  
Exercised (in shares) (713)  
Forfeited/Expired (in shares) (185,828)  
Outstanding at end of period (in shares) 4,262,702 4,215,643
Vested (in shares) 1,490,020  
Exercisable (in shares) 2,703,228  
Weighted-Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 5.49  
Granted (in dollars per share) 6.80  
Exercised (in dollars per share) 3.45  
Forfeited/Expired (in dollars per share) 6.48  
Outstanding at end of period (in dollars per share) 5.52 $ 5.49
Vested (in dollars per share) 4.20  
Exercisable (in dollars per share) $ 4.49  
Weighted-Average Remaining Contractual Term / Aggregate Intrinsic Value    
Weighted Average Remaining Contractual Term, Options Outstanding 8 years 8 years 6 months
Weighted Average Remaining Contractual Term, Vested 6 years 4 months 24 days  
Weighted Average Remaining Contractual Term, Exercisable 7 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding $ 379  
Aggregate Intrinsic Value, Vested 368  
Aggregate Intrinsic Value, Exercisable 375  
Unrecognized compensation expense $ 10,400  
Weighted-average vesting term 2 years 10 months 24 days