Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Non-vested RSUs (Details)

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Stockholders' Equity - Non-vested RSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Weighted Average Grant Date Fair Value        
Stock-based compensation $ 978 $ 787 $ 3,271 $ 2,444
Restricted Stock Units        
Number of Shares        
Non-vested at beginning of period (in shares)     3,771,342  
Granted (in shares)     27,500  
Vested (in shares)     (143,750)  
Forfeited/Cancelled     (624,075)  
Non-vested at end of period (in shares) 3,031,017   3,031,017  
Weighted Average Grant Date Fair Value        
Non-vested at beginning of period (in dollars per share)     $ 1.66  
Granted (in dollars per share)     1.20  
Vested (in dollars per share)     0.85  
Forfeited (in dollars per share)     1.61  
Non-vested at end of period (in dollars per share) $ 1.71   $ 1.71  
Stock-based compensation     $ 1,400  
Unrecognized compensation expense $ 3,800   $ 3,800  
Weighted average remaining period for recognition of unrecognized compensation expense     3 years 29 days