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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 June 30,Six Months Ended June 30,
2024202320242023
Incentive Plan$10,934 $10,236 $22,500$21,297 
Inducement Plan2,084 2,245 4,0074,720 
ESPP155 360 318831 
Stock-based compensation expense$13,173 $12,841 $26,825 $26,848 
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 
Granted461 6.30 
Exercised(108)3.25 $257 
Cancelled or Forfeited(2,029)9.67 
Outstanding at June 30, 202433,829 $8.14 6.39$13,242 
Exercisable at June 30, 202420,789 $7.86 5.11$13,242 
Vested and expected to vest at June 30, 202431,313 $8.07 6.28$13,242 
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 
Granted293 5.40 
Exercised(148)3.14 $320 
Cancelled or Forfeited(488)10.78 
Outstanding at June 30, 20245,184 $8.55 7.35$4,589 
Exercisable at June 30, 20242,753 $7.22 6.50$3,968 
Vested and expected to vest at June 30, 20244,708 $8.38 7.26$4,460 
Weighted Average Assumptions for Stock Option Awards Granted to Employees and Directors Under the Plans
Stock Incentive Plan
The following table summarizes the key assumptions used by the Company to value the stock option awards granted under the Incentive Plan during the six months ended June 30, 2024 and 2023:
Six Months Ended June 30,
20242023
Expected Life in Years5.85.5
Expected Volatility83.7 %84.3 %
Expected Dividend Yield0.0 %0.0 %
Risk-Free Interest Rate4.3 %3.9 %
Weighted average grant date fair value per share$4.56 $6.40 
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 six months ended June 30, 2024 and 2023:
Six Months Ended June 30,
20242023
Expected Life in Years5.85.5
Expected Volatility83.3 %84.3 %
Expected Dividend Yield0.0 %0.0 %
Risk-Free Interest Rate4.4 %3.8 %
Weighted average grant date fair value per share$3.90 $6.38 
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 
Granted259 5.80 
Vested(256)9.74 
Forfeited(446)8.80 
Unvested at June 30, 20245,149 $8.46 
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 
Granted164 5.36 
Vested(99)10.36 
Forfeited(143)9.92 
Unvested at June 30, 2024837 $8.95