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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Schedule of Total Stock-Based Compensation Expense
The Company recognized total stock-based compensation expense during the three and nine months ended September 30, 2021 and 2020 as follows (table in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Service-based awards:
Restricted stock units$81 $9 $263 $243 
Stock option awards315 243 1,050 1,019 
396 252 1,313 1,262 
Performance-based awards:
Restricted stock awards— — (391)— 
Restricted stock units— (123)— (1,148)
Stock option awards(35)121 (364)(390)
(35)(2)(755)(1,538)
Total$361 $250 $558 $(276)
Restricted stock awards  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Schedule of Restricted Stock Awards
A summary of the Company’s restricted stock awards during the nine months ended September 30, 2021 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 2021146,800 $5.70 
Forfeited(68,500)$5.70 
Unvested at September 30, 202178,300 $5.70 
A summary of the Company’s restricted stock awards during the nine months ended September 30, 2020 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 2020146,800 $5.70 
Unvested at September 30, 2020146,800 $5.70 
Restricted stock units - service based awards  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Schedule of Restricted Stock Awards
A summary of the Company’s service-based restricted stock units during the nine months ended September 30, 2021 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 2021265,494 $2.60 
Granted310,050 0.90 
Vested(221,474)2.38 
Forfeited(11,799)4.81 
Unvested at September 30, 2021342,271 $1.17 

A summary of the Company’s service-based restricted stock units during the nine months ended September 30, 2020 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 2020463,786 $4.26 
Granted188,904 2.09 
Vested(247,561)4.30 
Forfeited(159,724)4.26 
Unvested at September 30, 2020245,405 $2.72 
Restricted stock units - performance based awards  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Schedule of Restricted Stock Awards
A summary of the Company’s performance-based restricted stock units during the nine months ended September 30, 2020 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 2020988,958 $4.48 
Forfeited(988,958)4.48 
Unvested at Unvested at September 30, 2020— $— 
Stock option awards - service based awards  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Schedule of Stock Option Assumptions
The fair value of the service-based stock options granted for the nine months ended September 30, 2021 were based on the following assumptions:
September 30,
2021
Exercise price
$0.61 - $1.73
Expected stock price volatility
75.8% - 77.7%
Risk-free interest rate
0.47% - 1.06%
Term (years)
5.5 - 6
Schedule of Stock Options Activity
A summary of the Company’s service-based stock option activity for the nine months ended September 30, 2021 is as follows:
Shares
Underlying
Options		Weighted
Average Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Outstanding at January 1, 20215,717,956 $4.55 6.6$— 
Granted1,872,162 0.89 6.0— 
Forfeited(385,278)2.30 — — 
  Expired(1,333,220)7.16 — — 
Outstanding at September 30, 20215,871,620 $2.95 7.7$— 
Exercisable at September 30, 20212,539,438 $4.96 5.8$— 
A summary of the Company’s service-based stock option activity for the nine months ended September 30, 2020 is as follows:
Shares
Underlying
Options		Weighted
Average Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Outstanding at January 1, 20208,210,024 $7.06 5.1$107,000 
Granted2,252,344 1.95 5.9— 
Forfeited(440,026)3.96 — — 
Expired(4,090,150)8.24 — — 
Outstanding at September 30, 20205,932,192 $4.54 6.7$— 
Exercisable at September 30, 20202,889,218 $6.95 3.8$— 
Stock option awards - performance based awards  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]  
Schedule of Stock Options Activity
A summary of the performance-based stock options for the nine months ended September 30, 2021 is as follows:
Number of SharesWeighted Average
Exercise
Price
Outstanding at January 1, 2021750,000 $2.20 
Expired(750,000)2.20 
Outstanding at September 30, 2021— $— 
Exercisable at September 30, 2021— $— 
A summary of the performance-based stock options for the nine months ended September 30, 2020 is as follows:
Number of SharesWeighted Average
Exercise
Price
Outstanding at January 1, 2020388,125 $4.70 
Granted750,000 $2.20 
Forfeited(388,125)$4.70 
Outstanding at September 30, 2020750,000 $2.20 
Exercisable at September 30, 2020— $—