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SHARE BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Expensed and Capitalized, Amount
The following table summarizes the stock-based compensation expense recognized for the years ended December 31, 2022 and 2021:
Years ended December 31,
(In thousands)20222021
Cost of revenues$— $163 
Research and development19,853 6,624 
Selling, general and administrative43,435 34,617 
Total stock-based compensation expense$63,288 $41,404 
Schedule of Stock Options, Valuation Assumptions The fair value of incentive stock options and non-statutory stock options issued was estimated using the Black-Scholes model with the following weighted-average assumptions used during the year ended December 31, 2021:
December 31, 2021
Risk-free interest rates0.42 %
Expected volatility rates44 %
Expected dividend yield— %
Expected term (in years)6.0
Weighted-average grant date fair value of options$0.48 
The valuation model utilized the following assumptions:
Risk-free interest rate
1.47%
Expected volatility rates
58 %
Expected dividend yield
0.00%
Cost of equity (for derived service period)9.96%
Weighted-average grant date fair value of options
$8.13
The Black-Scholes model and a Monte Carlo simulation incorporated 100,000 scenarios. The valuation model utilized the following assumptions:
Risk-free interest rates2.82 %
Expected volatility rates63 %
Expected dividend yield— 
Cost of equity (for derived service period)14.64 %
Weighted-average grant date fair value of options$2.51 
Summary of Stock Option Outstanding
A summary of stock options outstanding as of December 31, 2022, and activity during the two years then ended, is presented below:
Shares
(In thousands)		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Term
(In years)
Outstanding at December 31, 20199,932 $0.17 7.9
Granted4,359 1.06 
Exercised(205)0.13 
Forfeited or expired(1,105)0.17 
Outstanding at December 31, 202012,981 $0.47 7.8
Granted208 1.06 
Exercised(1,611)0.16 
Forfeited or expired(81)0.89 
Cancelled(244)0.72 
Outstanding at December 31, 202111,253 $0.51 6.8
Granted— — 
Exercised(4,356)0.39 
Forfeited or expired(122)0.97 
Cancelled— — 
Outstanding at December 31, 20226,775 $0.59 6.2
Vested and exercisable at December 31, 20225,331 $0.47 5.8
Summary of Restricted Stock Unit, Outstanding A summary of RSUs outstanding as of December 31, 2022, and activity during the year then ended, is presented below:
Restricted Stock Unit AwardsShares
(In thousands)		Weighted-Average
Grant Date Fair
Value Per Share
Outstanding at December 31, 20214,525 $9.62 
Granted10,118 7.71 
Vested(2,801)2.93 
Forfeited(236)— 
Outstanding at December 31, 202211,606 $5.93