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STOCK PLANS (Tables) | 6 Months Ended
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Jun. 30, 2018
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,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of goods sold |  | $ | 1,046 |  |  | $ | 1,395 |  |  | $ | 2,252 |  |  | $ | 2,770 |
Research and development |  | 951 |  |  | 647 |  |  | 1,648 |  |  | 1,304 |
Selling, general and administrative |  | 5,050 |  |  | 5,303 |  |  | 11,532 |  |  | 10,670 |
Total |  | $ | 7,047 |  |  | $ | 7,345 |  |  | $ | 15,432 |  |  | $ | 14,744 |
Stock-based compensation from: |  |  |  |  |  |  |  |
Stock options (employee awards) |  | $ | 4,827 |  |  | $ | 5,741 |  |  | $ | 11,182 |  |  | $ | 11,658 |
Stock options (consultant awards) |  | 202 |  |  | 29 |  |  | 241 |  |  | 83 |
Restricted stock units (employee awards) |  | 1,819 |  |  | 1,389 |  |  | 3,609 |  |  | 2,611 |
Employee stock purchase plan |  | 199 |  |  | 186 |  |  | 400 |  |  | 392 |
Total |  | $ | 7,047 |  |  | $ | 7,345 |  |  | $ | 15,432 |  |  | $ | 14,744 |
Schedule of the Company's stock option activity and related information | 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, 2018:
Stock Options |  | Number of Options |  | Weighted Average Exercise Price
Outstanding at December 31, 2017 |  | 4,951,493 |  |  | $ | 43.51 |
Granted |  | 1,683,007 |  |  | 38.33 |
Exercised |  | (103,263 | ) |  | 14.45 |
Forfeited |  | (242,188 | ) |  | 44.43 |
Expired |  | (253,483 | ) |  | 64.19 |
Outstanding at June 30, 2018 |  | 6,035,566 |  |  | 41.65 |
Restricted Stock Units |  | Number of Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2017 |  | 499,546 |  |  | $ | 47.32 |
Granted |  | 327,779 |  |  | 38.33 |
Vested |  | (147,844 | ) |  | 49.70 |
Forfeited |  | (42,722 | ) |  | 45.86 |
Unvested at June 30, 2018 |  | 636,759 |  |  | 42.23 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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