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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023 and 2022 as follows (table in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2023202220232022
Service-based awards:
Restricted Stock Units$112 $46 $276 $84 
Stock Option Awards100 130 438 401 
   Total Service Based Awards212 176 714 485 
Performance-based awards:
Restricted Stock Awards— — — (391)
Total$212 $176 $714 $94 
Schedule of Stock Option Assumptions
The fair value of the service-based stock options granted for the nine months ended September 30, 2023 were based on the following assumptions:
Nine Months Ended September 30, 2023
Exercise price
$1.37 - $2.83
Expected stock price volatility
81.6% - 81.8%
Risk-free interest rate
3.41% - 3.46%
Term (years)
5.6 - 6
Schedule of Stock Options Activity
A summary of the Company’s service-based stock option activity for the nine months ended September 30, 2023 is as follows:
Shares
Underlying
Options		Weighted
Average Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic Value
in yearsin thousands
Outstanding at January 1, 20231,206,905 $8.32 
Granted382,745 1.48 
Forfeited(143,430)2.82 
Expired(78,727)26.74 
Outstanding at September 30, 20231,367,493 $5.93 8.4$680 
Exercisable at September 30, 2023444,836 $14.64 7$114 
A summary of the Company’s service-based stock option activity for the nine months ended September 30, 2022 is as follows:
Shares
Underlying
Options		Weighted
Average Exercise
Price		Weighted
Average
Remaining
Contractual
Term
in years
Outstanding at January 1, 2022528,591 $32.01 7.5
Granted898,659 1.49 5.5
Forfeited(30,093)15.11 — 
Expired(85,466)82.09 — 
Outstanding at September 30, 20221,311,691 $8.23 9.1
Exercisable at September 30, 2022243,973 $29.31 6.9
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, 2023 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 2023891 $62.70 
Unvested at September 30, 2023891 $62.70 
A summary of the Company’s restricted stock awards during the nine months ended September 30, 2022 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 20227,118 $62.70 
Forfeited (1)(6,227)$62.70 
Unvested at September 30, 2022891 $62.70 
__________
1.These forfeited awards were due to the resignation of the Company's Chief Development Officer on March 25, 2022 and reduced stock-based compensation expense by $0.4 million in 2022.
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, 2023 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 2023125,000 $1.47 
Granted313,065 1.87 
Vested(125,000)1.47 
Forfeited(25,665)1.37 
Unvested at September 30, 2023287,400 $1.85 
A summary of the Company’s service-based restricted stock units during the nine months ended September 30, 2022 is as follows:
Number of SharesWeighted Average
Grant-Date
Fair Value
Unvested at January 1, 202229,289 $12.87 
Granted125,000 1.47 
Vested(23,515)11.33 
Forfeited(5,774)19.00 
Unvested at September 30, 2022125,000 $1.47