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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Compensation Cost Related to Share Based Compensation | Share-Based Compensation. The compensation cost that has been included in the statement of comprehensive income (loss) for all share-based compensation arrangements is as follows:
| Year Ended December 31, |
(in thousands) | 2018 |  |  | 2017 |  |  | 2016 |
Sales, general and administrative expense | $ | 31,847 |  |  | $ | 27,951 |  |  | $ | 16,770 |
Research and development expense |  | 26,221 |  |  |  | 14,571 |  |  |  | 11,694 |
Share-based compensation expense | $ | 58,068 |  |  | $ | 42,522 |  |  | $ | 28,464 |
Weighted-Average Assumptions for Stock Option Grants using Black-Scholes Option-Pricing Model | The estimated fair value of each stock option award granted was determined on the date of grant using the Black-Scholes option-pricing valuation model with the following weighted-average assumptions for option grants during the three years ended December 31, 2018:
| Year Ended December 31, |
(in thousands) | 2018 |  |  | 2017 |  |  | 2016 |
Risk-free interest rate |  | 2.5 | % |  |  | 2.0 | % |  |  | 1.4 | %
Expected volatility of common stock |  | 59.5 | % |  |  | 58.0 | % |  |  | 60.0 | %
Dividend yield |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected option term | 4.7 years |  |  | 5.7 years |  |  | 5.6 years |
Summary and Changes in Stock Options Outstanding | A summary of the status of the Company’s stock options as of December 31, 2018, 2017 and 2016 and of changes in options outstanding under the plans during the three years ended December 31, 2018 is as follows:
| 2018 |  |  | 2017 |  |  | 2016 |
(in thousands, except weighted average data) | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at January 1 |  | 6,356 |  |  | $ | 28.83 |  |  |  | 6,112 |  |  | $ | 20.01 |  |  |  | 5,507 |  |  | $ | 15.63 |
Granted |  | 1,040 |  |  |  | 84.97 |  |  |  | 1,807 |  |  |  | 46.55 |  |  |  | 1,077 |  |  |  | 40.19 |
Exercised |  | (1,592 | ) |  |  | 18.95 |  |  |  | (1,353 | ) |  |  | 10.41 |  |  |  | (341 | ) |  |  | 7.60 |
Canceled |  | (58 | ) |  |  | 64.67 |  |  |  | (210 | ) |  |  | 43.05 |  |  |  | (131 | ) |  |  | 34.35 |
Outstanding at December 31 |  | 5,746 |  |  | $ | 41.38 |  |  |  | 6,356 |  |  | $ | 28.83 |  |  |  | 6,112 |  |  | $ | 20.01 |
Summary and Changes in Restricted Stock Units Outstanding | A summary of the status of the Company’s RSUs as of December 31, 2018, 2017, and 2016 and of changes in RSUs outstanding under the plans for the three years ended December 31, 2018 is as follows:
| 2018 |  |  | 2017 |  |  | 2016 |
(in thousands, except weighted average data) | Number of Units |  |  | Weighted Average Grant Date Fair Value per Unit |  |  | Number of Units |  |  | Weighted Average Grant Date Fair Value per Unit |  |  | Number of Units |  |  | Weighted Average Grant Date Fair Value per Unit |
Outstanding at January 1 |  | 1,080 |  |  | $ | 40.30 |  |  |  | 883 |  |  | $ | 29.33 |  |  |  | 910 |  |  | $ | 24.23 |
Granted |  | 540 |  |  |  | 85.29 |  |  |  | 588 |  |  |  | 47.21 |  |  |  | 326 |  |  |  | 36.73 |
Cancelled |  | (58 | ) |  |  | 36.21 |  |  |  | (41 | ) |  |  | 40.62 |  |  |  | (69 | ) |  |  | 32.50 |
Converted into common shares |  | (429 | ) |  |  | 59.23 |  |  |  | (350 | ) |  |  | 24.19 |  |  |  | (284 | ) |  |  | 20.71 |
Outstanding at December 31 |  | 1,133 |  |  | $ | 62.31 |  |  |  | 1,080 |  |  | $ | 40.30 |  |  |  | 883 |  |  | $ | 29.33 |

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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://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=109197908&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=115993241&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=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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 http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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