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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Unrecognized compensation expense is expected to be recognized At September 30, 2021, the Company had unrecognized compensation expense of $7,201 related to granted but unvested stock awards, which is to be recognized as follows:
Remainder of 2021$1,022 
20222,632 
20231,917 
20241,158 
2025472 
 Total$7,201 
Summary of restricted stock activity The following table summarizes restricted stock activity under the Plans from December 31, 2020 through September 30, 2021:
 Number of
Shares		Weighted
Average
Unvested, December 31, 20201,886 $5.14 
Granted1,982 $2.88 
Vested(325)$8.31 
Forfeited(138)$6.26 
Unvested, September 30, 20213,405 $3.04