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STOCK PLANS (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of goods sold |  | $ | 1,512 |  |  | $ | 1,546 |  |  | $ | 4,429 |  |  | $ | 4,050 |
Research and development |  | 1,156 |  |  | 1,401 |  |  | 3,591 |  |  | 3,944 |
Selling, general and administrative |  | 8,116 |  |  | 8,007 |  |  | 23,336 |  |  | 21,030 |
Total |  | $ | 10,784 |  |  | $ | 10,954 |  |  | $ | 31,356 |  |  | $ | 29,024 |
Stock-based compensation from: |  |  |  |  |  |  |  |
Stock options |  | $ | 6,458 |  |  | $ | 7,181 |  |  | $ | 19,507 |  |  | $ | 19,795 |
Restricted stock units |  | 4,126 |  |  | 3,552 |  |  | 11,164 |  |  | 8,589 |
Employee stock purchase plan |  | 200 |  |  | 221 |  |  | 685 |  |  | 640 |
Total |  | $ | 10,784 |  |  | $ | 10,954 |  |  | $ | 31,356 |  |  | $ | 29,024 |
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, 2021:
Stock Options |  | Number of Options |  | Weighted Average Exercise Price (Per Share)
Outstanding at December 31, 2020 |  | 6,235,118 |  |  | $ | 45.98 |
Granted |  | 769,352 |  |  | 61.33 |
Exercised |  | (553,023) |  |  | 34.43 |
Forfeited |  | (238,865) |  |  | 46.19 |
Expired |  | (42,416) |  |  | 76.62 |
Outstanding at September 30, 2021 |  | 6,170,166 |  |  | 48.71 |
Restricted Stock Units |  | Number of Units |  | Weighted Average Grant Date Fair Value (Per Share)
Unvested at December 31, 2020 |  | 957,453 |  |  | $ | 46.34 |
Granted |  | 401,845 |  |  | 61.53 |
Vested |  | (302,228) |  |  | 44.87 |
Forfeited |  | (114,562) |  |  | 49.95 |
Unvested at September 30, 2021 |  | 942,508 |  |  | 52.85 |
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 |  | Nine Months Ended September 30, 2021
Expected dividend yield |  | None
Risk-free interest rate |  | 0.82%
Expected volatility |  | 49.26%
Expected term of options |  | 5.42 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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + 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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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