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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2017 | 12,726 |  |  | $ | 25.24 |  |  |  |  |
Granted | 2,997 |  |  | 52.67 |  |  |  |  |
Exercised | (1,493 | ) |  | 17.94 |  |  |  |  |
Forfeited or expired | (441 | ) |  | 33.59 |  |  |  |  |
Outstanding as of December 31, 2018 | 13,789 |  |  | $ | 31.73 |  |  | 7.36 |  | $ | 146,270 |
Exercisable as of December 31, 2018 | 4,556 |  |  | $ | 20.94 |  |  | 5.85 |  | $ | 82,716 |
Options vested or expected to vest as of December 31, 2018 (1) | 12,499 |  |  | $ | 30.60 |  |  | 7.23 |  | $ | 141,643 |
(1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted | The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Risk-free rate | 2.9 | % |  | 2.4 | % |  | 1.7 | %
Expected dividend yield | 0.35 | % |  | 0.40 | % |  | 0.83 | %
Expected volatility | 39 | % |  | 41 | % |  | 41 | %
Expected term (in years) | 5.4 |  |  | 5.4 |  |  | 5.6 |
Nonvested Restricted Stock Shares Activity [Table Text Block] | The following table summarizes the Company's restricted stock activity:
| Shares (in thousands) |  | Weighted-Average Grant Fair Value |  | Aggregate Intrinsic Value (in thousands)
Nonvested as of December 31, 2017 | 20 |  |  | $ | 17.03 |  |  |
Granted | — |  |  | — |  |  |
Vested | (20 | ) |  | 17.03 |  |  | 993 |
Forfeited or expired | — |  |  | — |  |  |
Nonvested as of December 31, 2018 | — |  |  | $ | — |  |  | $ | — |
Stock-Based Compensation Expense | The following table presents the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Cost of revenue | $ | 2,447 |  |  | $ | 1,881 |  |  | $ | 1,052 |
Research, development, and engineering | 14,578 |  |  | 11,022 |  |  | 6,271 |
Selling, general, and administrative | 24,065 |  |  | 19,039 |  |  | 13,235 |
| $ | 41,090 |  |  | $ | 31,942 |  |  | $ | 20,558 |

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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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