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STOCK PLANS (Tables) | 6 Months Ended
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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,
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Cost of goods sold |  | $ | 1,436 |  |  | $ | 1,478 |  |  | $ | 3,160 |  |  | $ | 2,830 |
Research and development |  | 1,722 |  |  | 1,520 |  |  | 3,597 |  |  | 2,978 |
Selling, general and administrative |  | 7,797 |  |  | 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 units |  | 4,969 |  |  | 4,717 |  |  | 10,219 |  |  | 8,830 |
Employee stock purchase plan |  | 244 |  |  | 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 |
Granted |  | 1,426,343 |  |  | 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 |
Granted |  | 759,762 |  |  | 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 Assumption |  | Six Months Ended June 30, 2023
Expected dividend yield |  | None
Risk-free interest rate |  | 4.00%
Expected volatility |  | 41.32%
Expected term of options |  | 4.86 years

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