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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Fair Value of Options
The fair value of the stock options granted is 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,
 2023202220232022
Expected stock price volatility59.2 %61.3 %59.3 %62.2 %
Risk free interest rate3.8 %3.0 %3.9 %1.6 %
Expected life of options (years)5.55.35.55.3
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, 2023 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, 202219,064 $11.31   
Granted5,194 $11.97   
Exercised(655)$6.73   
Forfeited(160)$11.36   
Expired(35)$13.99 
Options outstanding, June 30, 202323,408 $11.58 6.9$41.1 
Vested and unvested expected to vest, June 30, 202321,510 $11.52 6.7$39.3 
Exercisable at June 30, 202313,061 $11.02 5.3$32.5 
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, 2023 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, 20229,717 $13.07   
Granted3,967 $13.06   
Vested(2,752)$12.12   
Forfeited(567)$9.86   
Non-vested units as of June 30, 202310,365 $13.53 2.3$130.2 
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)2023202220232022
Research and development expense$4,117 $4,379 $12,607 $13,744 
Selling, general, and administrative expense12,460 8,084 38,864 29,370 
Total equity compensation expense$16,577 $12,463 $51,471 $43,114