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STOCK PLANS (Tables) | 6 Months Ended
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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