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STOCK PLANS (Tables)
9 Months Ended
Sep. 30, 2024
Stockholders' Equity Note [Abstract]  
Schedule of Recognized Stock-Based Compensation Expense
The Company recognized stock-based compensation expense in the periods presented as follows (in thousands):
Three Months Ended
September 30,
Nine Months Ended
September 30,
2024202320242023
Cost of goods sold$1,509 $1,272 $3,896 $4,432 
Research and development1,794 2,220 5,522 5,817 
Selling, general and administrative9,137 9,038 25,970 25,226 
Contingent consideration (gains) charges, restructuring charges and other790 — 3,517 — 
        Total$13,230 $12,530 $38,905 $35,475 
Stock-based compensation from:
    Stock options$4,767 $5,957 $17,292 $18,163 
    Restricted stock units8,276 6,373 21,003 16,592 
    Employee stock purchase plan187 200 610 720 
        Total$13,230 $12,530 $38,905 $35,475 
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 nine months ended September 30, 2024:
Stock Options Number of
Stock Options
 Weighted Average Exercise Price (Per Share)
 Outstanding at December 31, 2023
7,079,748 $49.40 
     Granted1,164,323 30.87 
     Forfeited(240,232)45.52 
     Expired(1,108,285)61.72 
 Outstanding at September 30, 2024
6,895,554 44.42 
Restricted Stock Units Number of
Restricted
Stock Units
 Weighted Average Grant Date Fair Value (Per Share)
Unvested at December 31, 2023
1,364,618 $47.66 
     Granted1,936,065 28.82 
     Vested(461,715)49.33 
     Forfeited(239,810)39.41 
Unvested at September 30, 2024
2,599,158 33.90 
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 AssumptionNine Months Ended September 30, 2024
Expected dividend yieldNone
Risk-free interest rate3.98%
Expected volatility40.8%
Expected term of options5.23 years