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Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
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):
Nine Months Ended September 30,
20232022
Incentive Plan$30,934 $23,687 
Inducement Plan7,346 4,604 
ESPP847 1,130 
Stock-based compensation expense$39,127 $29,421 
Stock Plan Activities
Related activity under the Incentive Plan is as follows (in thousands):
Awards
Available
Options
Outstanding
Weighted
Average
Exercise
Price
Balance December 31, 20224,206 31,179 $8.56 
Plan amendment7,000 — — 
Restricted stock unit awards granted(314)— — 
Restricted stock unit awards cancelled491 — — 
Stock option awards granted(618)618 9.01 
Stock option awards exercised— (856)5.25 
Stock option awards cancelled1,169 (1,169)9.93 
Balance September 30, 202311,934 29,772 $8.61 
Related activity under the Inducement Plan is as follows (in thousands):
Awards
Available
Options
Outstanding
Weighted
Average
Exercise
Price
Balance December 31, 2022947 5,341 $8.80 
Restricted stock unit awards granted(457)— — 
Restricted stock unit awards cancelled93 — — 
Stock option awards granted(992)992 8.64 
Stock option awards exercised— (336)3.67 
Stock option awards cancelled609 (609)10.36 
Balance September 30, 2023200 5,388 $8.91 
Weighted Average Assumptions for Stock Option Awards Granted to Employees and Directors Under the Plans
Weighted Average Assumptions for Stock Option Awards Granted to Employees and Directors under the Incentive and Inducement Plans
Nine Months Ended September 30,
20232022
Expected Life in Years5.55.5
Expected Volatility83.9 %84.1 %
Expected Dividend Yield0.0 %0.0 %
Risk-Free Interest Rate3.9 %2.9 %