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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Fair Value of Options
The fair value of the stock options granted were estimated on the date of grant using a Black-Scholes option pricing model with the following weighted-average assumptions:
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Expected stock price volatility56.6 %59.2 %57.2 %59.3 %
Risk free interest rate4.3 %3.8 %4.0 %3.9 %
Expected life of options (years)5.65.55.65.5
Expected annual dividend per share$— $— $— $— 
Schedule of Stock Options Activity A summary of the Company's stock options for the six months ended June 30, 2024 were as follows:
Number of
Shares
Weighted Average Exercise 
Price
Weighted Average Remaining
Years
Aggregate
Intrinsic
Value
 (in thousands)  (in millions)
Options outstanding, December 31, 202323,002 $11.69   
Granted4,521 $13.79   
Exercised(576)$7.50   
Forfeited(305)$12.61   
Expired(106)$15.44 
Options outstanding, June 30, 202426,536 $12.11 6.3$8.6 
Vested and non-vested expected to vest, June 30, 202424,787 $12.07 6.1$8.5 
Exercisable at June 30, 202416,639 $11.67 4.9$8.3 
Schedule of Non-Vested RSU Activity under the Plan A summary of non-vested RSU activity under the Plan for the six months ended June 30, 2024 is as follows:
Number of
Shares
Weighted
Average Grant
Date Fair
Value
Weighted 
Average
Remaining 
Years
Aggregate
Intrinsic
Value
(in thousands)(in millions)
Non-vested units as of December 31, 202310,033 $13.37   
Granted3,430 $15.07   
Vested(3,503)$13.36   
Forfeited(415)$14.57   
Non-vested units as of June 30, 20249,545 $13.90 2.4$94.7 
Schedule of Equity Compensation Expenses
The following table summarizes information related to compensation expense recognized in the Company's Consolidated Statements of Operations related to the equity awards:
 Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Research and development expense$3,061 $4,117 $7,932 $12,607 
Selling, general, and administrative expense13,136 12,460 39,068 38,864 
Total equity compensation expense$16,197 $16,577 $47,000 $51,471