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STOCK-BASED COMPENSATION
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
Stock-based compensation expense is included in Selling, general and administrative expense on our Condensed Consolidated Statements of Operations and Comprehensive Loss. We recognized stock-based compensation expense of $0.5 million and $0.8 million for the three months ended March 31, 2024 and 2023, respectively.

2018 Long-Term Incentive Equity Plan
Our 2018 Long-Term Incentive Equity Plan, as amended (the “2018 Plan”) provides for awards of options, stock appreciation rights, restricted stock, restricted stock units, warrants or other securities which may be convertible, exercisable or exchangeable for or into our common stock. As of March 31, 2024, there were 1,068,905 shares of common stock available to be issued under the 2018 Plan.

Stock Options
Stock option activity was as follows:
Shares Underlying
Options 		Weighted Average Per Share
Exercise Price		Weighted Average Remaining
Contractual Life		Aggregate Intrinsic
Value
(In Thousands)
Options outstanding at December 31, 2023376,940 $11.21 1.91 years$(1,566)
Cancelled or terminated(81,902)8.83 
Options outstanding at March 31, 2024295,038 11.87 2.99 years(2,312)
Options outstanding and vested at March 31, 2024248,290 11.54 1.27 years(2,895)

Restricted Stock Units
Restricted stock unit activity was as follows:
Number of Restricted Stock UnitsWeighted-Average Grant Date Fair Value
Outstanding at December 31, 2023238,275 $13.35 
Granted15,267 4.38 
Vested(22,019)10.99 
Forfeited(4,426)12.38 
Outstanding at March 31, 2024227,097 13.03 

Prefunded Warrants
As of March 31, 2024, there were 300,357 perpetual non-redeemable prefunded warrants outstanding with an exercise price of $0.01 per share. There was no activity during the three months ended March 31, 2024.

Unrecognized Stock-Based Compensation
As of March 31, 2024, unrecognized stock-based compensation costs for unvested awards was approximately $0.1 million, which is expected to be recognized over a weighted average period of 1.8 years.