v3.24.2
STOCK PLANS
 6 Months Ended
Jun. 30, 2024
Stockholders' Equity Note [Abstract]  
STOCK PLANS STOCK PLANS
Stock-Based Compensation
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,
2024202320242023
Cost of goods sold$1,259 $1,436 $2,387 $3,160 
Research and development1,925 1,722 3,728 3,597 
Selling, general and administrative8,848 7,797 16,833 16,188 
Contingent consideration charges (gains), restructuring charges and other492 — 2,727 — 
        Total$12,524 $10,955 $25,675 $22,945 
Stock-based compensation from:
    Stock options$5,796 $5,742 $12,525 $12,206 
    Restricted stock units6,517 4,969 12,727 10,219 
    Employee stock purchase plan211 244 423 520 
        Total$12,524 $10,955 $25,675 $22,945 
Equity Awards
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, 2024:
Stock Options Number of
Stock Options		 Weighted Average Exercise Price (Per Share)
 Outstanding at December 31, 2023
7,079,748 $49.40 
     Granted1,099,223 31.46 
     Forfeited(539,743)45.57 
     Expired(692,325)61.76 
 Outstanding at June 30, 2024
6,946,903 44.69 
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 
     Granted1,845,665 29.22 
     Vested(429,709)49.33 
     Forfeited(104,195)46.88 
Unvested at June 30, 2024
2,676,379 34.71 
The weighted average fair value of stock options granted during the six months ended June 30, 2024 was $13.42 per share. 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, 2024
Expected dividend yieldNone
Risk-free interest rate4.00%
Expected volatility40.80%
Expected term of options5.25 years
Employee Stock Purchase Plan
The Company’s Amended and Restated 2014 Employee Stock Purchase Plan, or ESPP, features two six-month offering periods per year, running from January 1 to June 30 and July 1 to December 31. Under the ESPP, employees may elect to contribute after-tax earnings to purchase shares at 85% of the closing fair market value of the Company’s common stock on either the offering date or the purchase date, whichever is lesser. During the six months ended June 30, 2024, 56,077 shares were purchased and issued through the ESPP.