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STOCK PLANS (Tables)

6 Months Ended

Jun. 30, 2022

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,
						2022						2021						2022						2021
Cost of goods sold						$	1,478					$	1,465					$	2,830					$	2,917
Research and development						1,520						1,329						2,978						2,435
Selling, general and administrative						8,546						7,667						16,925						15,219
Total						$	11,544					$	10,461					$	22,733					$	20,571
Stock-based compensation from:
Stock options						$	6,542					$	6,552					$	13,327					$	13,048
Restricted stock units						4,717						3,646						8,830						7,038
Employee stock purchase plan						285						263						576						485
Total						$	11,544					$	10,461					$	22,733					$	20,571

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, 2022:

Stock Options						Number of Options						Weighted Average Exercise Price (Per Share)
Outstanding at December 31, 2021						6,050,540						$	49.32
Granted						1,010,780						60.22
Exercised						(630,413)						34.80
Forfeited						(54,215)						52.41
Expired						(13,054)						85.48
Outstanding at June 30, 2022						6,363,638						52.39

Restricted Stock Units						Number of Units						Weighted Average Grant Date Fair Value (Per Share)
Unvested at December 31, 2021						955,277						$	52.85
Granted						568,049						60.63
Vested						(298,607)						49.65
Forfeited						(44,929)						54.16
Unvested at June 30, 2022						1,179,790						57.36

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, 2022
Expected dividend yield						None
Risk-free interest rate						2.83%
Expected volatility						45.15%
Expected term of options						4.92 years

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- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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