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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
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 statements of operations and comprehensive income (loss) for all share-based compensation arrangements is as follows:
| Year Ended December 31, |
(in thousands) | 2019 |  |  | 2018 |  |  | 2017 |
Sales, general and administrative expense | $ | 49,489 |  |  | $ | 31,847 |  |  | $ | 27,951 |
Research and development expense |  | 25,773 |  |  |  | 26,221 |  |  |  | 14,571 |
Share-based compensation expense | $ | 75,262 |  |  | $ | 58,068 |  |  | $ | 42,522 |
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:
| Year Ended December 31,
(in thousands) | 2019 |  | 2018 |  | 2017
Risk-free interest rate | 2.4% |  | 2.5% |  | 2.0%
Expected volatility of common stock | 54.8% |  | 59.5% |  | 58.0%
Dividend yield | 0.0% |  | 0.0% |  | 0.0%
Expected option term | 5.4 years |  | 4.7 years |  | 5.7 years
Summary and Changes in Stock Options Outstanding | A summary of activity related to stock options follows:
| Year Ended December 31, |
| 2019 |  |  | 2018 |  |  | 2017 |
(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 |  | 5,746 |  |  | $ | 41.38 |  |  |  | 6,356 |  |  | $ | 28.83 |  |  |  | 6,112 |  |  | $ | 20.01 |
Granted |  | 1,416 |  |  |  | 82.27 |  |  |  | 1,040 |  |  |  | 84.97 |  |  |  | 1,807 |  |  |  | 46.55 |
Exercised |  | (983 | ) |  |  | 27.95 |  |  |  | (1,592 | ) |  |  | 18.95 |  |  |  | (1,353 | ) |  |  | 10.41 |
Canceled |  | (72 | ) |  |  | 75.09 |  |  |  | (58 | ) |  |  | 64.67 |  |  |  | (210 | ) |  |  | 43.05 |
Outstanding at December 31 |  | 6,107 |  |  | $ | 52.62 |  |  |  | 5,746 |  |  | $ | 41.38 |  |  |  | 6,356 |  |  | $ | 28.83 |
Summary and Changes in Restricted Stock Units Outstanding | A summary of activity related to RSUs follows:
| Year Ended December 31, |
| 2019 |  |  | 2018 |  |  | 2017 |
(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 |  | 1,133 |  |  | $ | 62.31 |  |  |  | 1,080 |  |  | $ | 40.30 |  |  |  | 883 |  |  | $ | 29.33 |
Granted |  | 707 |  |  |  | 82.66 |  |  |  | 540 |  |  |  | 85.29 |  |  |  | 588 |  |  |  | 47.21 |
Cancelled |  | (56 | ) |  |  | 74.49 |  |  |  | (58 | ) |  |  | 36.21 |  |  |  | (41 | ) |  |  | 40.62 |
Converted into common shares |  | (416 | ) |  |  | 54.30 |  |  |  | (429 | ) |  |  | 59.23 |  |  |  | (350 | ) |  |  | 24.19 |
Outstanding at December 31 |  | 1,368 |  |  | $ | 74.77 |  |  |  | 1,133 |  |  | $ | 62.31 |  |  |  | 1,080 |  |  | $ | 40.30 |

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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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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