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Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
The Company recorded the following stock-based compensation expense (in thousands):
Three Months Ended March 31,
20242023
Incentive Plan$11,566 $11,061 
Inducement Plan1,923 2,475 
ESPP163 471 
Stock-based compensation expense$13,652 $14,007 
The following table summarizes stock option activity under the Incentive Plan:
Shares
(in thousands)		Weighted Average Exercise Price per ShareWeighted Average Remaining Contractual Term
(in years)		Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 202335,505 $8.24 
Granted— — 
Exercised(48)3.27 $103 
Cancelled or Forfeited(1,068)9.60 
Outstanding at March 31, 202434,389 $8.20 6.61$6,951 
Exercisable at March 31, 202420,922 $7.88 5.30$6,951 
Vested and expected to vest at March 31, 202431,784 $8.13 6.49$6,951 
The following table summarizes stock option activity under the Inducement Plan:
Shares
(in thousands)		Weighted Average Exercise Price per ShareWeighted Average Remaining Contractual Term
(in years)		Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 20235,527 $8.77 
Granted92 5.25 
Exercised(128)3.09 $274 
Cancelled or Forfeited(300)10.86 
Outstanding at March 31, 20245,191 $8.73 7.53$2,454 
Exercisable at March 31, 20242,628 $7.53 6.76$2,128 
Vested and expected to vest at March 31, 20244,684 $8.59 7.46$2,373 
Weighted Average Assumptions for Stock Option Awards Granted to Employees and Directors Under the Plans
Stock Incentive Plan
There were no stock option awards granted under the Incentive Plan during the three months ended March 31, 2024. The following table summarizes the key assumptions used by the Company to value the stock option awards granted under the Incentive Plan during the three months ended March 31, 2023:
Three Months Ended
March 31, 2023
Expected Life in Years5.5
Expected Volatility84.2 %
Expected Dividend Yield0.0 %
Risk-Free Interest Rate3.6 %
Weighted average grant date fair value per share$7.47 
Inducement Equity Incentive Plan
The following table summarizes the key assumptions used by the Company to value the stock option awards granted under the Inducement Plan during the three months ended March 31, 2024 and 2023:
Three Months Ended March 31,
20242023
Expected Life in Years5.85.5
Expected Volatility82.8 %84.2 %
Expected Dividend Yield0.0 %0.0 %
Risk-Free Interest Rate4.1 %3.7 %
Weighted average grant date fair value per share$3.77 $6.85 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The following table summarizes restricted stock unit activity under the Incentive Plan:
Shares
(in thousands)		Weighted Average Grant Date Fair Value
Unvested at December 31, 20235,592 $8.67 
Granted128 5.30 
Vested(96)12.30 
Forfeited(313)8.65 
Unvested at March 31, 20245,311 $8.52 
The following table summarizes restricted stock unit activity under the Inducement Plan:
Shares
(in thousands)		Weighted Average Grant Date Fair Value
Unvested at December 31, 2023915 $9.90 
Granted63 5.25 
Vested(59)11.96 
Forfeited(106)10.41 
Unvested at March 31, 2024813 $9.32