Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Non-vested RSUs (Details)

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Stockholders' Equity - Non-vested RSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Weighted Average Grant Date Fair Value    
Stock-based compensation $ 4,407 $ 3,284
Restricted Stock Units    
Number of Shares    
Non-vested at beginning of period (in shares) 3,771,342 2,945,585
Granted (in shares) 4,358,462 2,536,850
Vested (in shares) (1,561,688) (1,519,493)
Forfeited/Cancelled (649,620) (191,600)
Non-vested at end of period (in shares) 5,918,496 3,771,342
Weighted Average Grant Date Fair Value    
Non-vested at beginning of period (in dollars per share) $ 1.66 $ 0.73
Granted (in dollars per share) 0.70 2.11
Vested (in dollars per share) 1.20 0.71
Forfeited (in dollars per share) 1.64 0.69
Non-vested at end of period (in dollars per share) $ 1.08 $ 1.66
Stock-based compensation $ 1,800 $ 1,100
Unrecognized compensation expense $ 6,200  
Weighted average remaining period for recognition of unrecognized compensation expense 3 years 4 months 17 days  
Shares of common stock underlying vested RSUs withheld 466,059