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STOCK PLANS (Tables)
6 Months Ended
Jun. 30, 2023
Stockholders' Equity Note [Abstract]  
Schedule of Recognized Stock-Based Compensation in Consolidated Statements of Operations
The Company recognized stock-based compensation expense in the periods presented as follows (in thousands):
Three Months Ended
June 30,
Six Months Ended
June 30,
2023202220232022
Cost of goods sold$1,436 $1,478 $3,160 $2,830 
Research and development1,722 1,520 3,597 2,978 
Selling, general and administrative7,797 8,546 16,188 16,925 
        Total$10,955 $11,544 $22,945 $22,733 
Stock-based compensation from:
    Stock options$5,742 $6,542 $12,206 $13,327 
    Restricted stock units4,969 4,717 10,219 8,830 
    Employee stock purchase plan244 285 520 576 
        Total$10,955 $11,544 $22,945 $22,733 
Schedule of the Company's Stock Option Activity and Restricted Stock Unit Activity
The following tables contain information about the Company’s stock option and restricted stock unit, or RSU, activity for the six months ended June 30, 2023:
Stock Options Number of
Stock Options
 Weighted Average Exercise Price (Per Share)
 Outstanding at December 31, 2022
6,272,994 $52.38 
     Granted1,426,343 39.15 
     Exercised(61,896)30.91 
     Forfeited(106,927)57.38 
     Expired(88,438)55.06 
 Outstanding at June 30, 2023
7,442,076 49.91 
Restricted Stock Units Number of
Restricted
Stock Units
 Weighted Average Grant Date Fair Value (Per Share)
Unvested at December 31, 2022
1,149,462 $57.26 
     Granted759,762 39.24 
     Vested(368,641)54.96 
     Forfeited(95,349)58.56 
Unvested at June 30, 2023
1,445,234 48.27 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions The fair values of stock options granted were estimated using the Black-Scholes option valuation model with the following weighted average assumptions:
Black-Scholes Weighted Average AssumptionSix Months Ended June 30, 2023
Expected dividend yieldNone
Risk-free interest rate4.00%
Expected volatility41.32%
Expected term of options4.86 years