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Stock-based Compensation, Restricted Stock Units (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Weighted average grant date fair value [Abstract]  
Unrecognized compensation expense | $ $ 167
Weighted average period of recognition 9 months 18 days
Restricted Stock Units [Member]  
Number of shares [Abstract]  
Unvested at beginning of period (in shares) | shares 0
Granted (in shares) | shares 290,861
Vested (in shares) | shares (146,364)
Unvested at end of period (in shares) | shares 144,497
Weighted average grant date fair value [Abstract]  
Unvested at beginning of period (in dollars per share) | $ / shares $ 0
Granted (in dollars per share) | $ / shares 1.44
Vested (in dollars per share) | $ / shares 1.42
Unvested at end of period (in dollars per share) | $ / shares $ 1.45