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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-Based Compensation Expense | The consolidated statements of operations for the three and nine months ended September 29, 2018 and September 30, 2017 include the following stock-based compensation expense related to stock option awards, restricted stock awards, restricted stock unit awards, performance stock unit awards and the employee stock purchase plan (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 29, 2018 |  |  | September 30, 2017 |  |  | September 29, 2018 |  |  | September 30, 2017 |
Cost of sales |  | $ | 488 |  |  | $ | 726 |  |  | $ | 1,696 |  |  | $ | 2,251 |
Selling and administrative expenses |  |  | 6,731 |  |  |  | 10,768 |  |  |  | 22,855 |  |  |  | 25,558 |
Research and development expenses |  |  | 1,994 |  |  |  | 780 |  |  |  | 3,633 |  |  |  | 2,259 |
Total stock-based compensation |  | $ | 9,213 |  |  | $ | 12,274 |  |  | $ | 28,184 |  |  | $ | 30,068 |
Relevant Data Used to Determine the Value of Stock Options Granted During the Period | The relevant data used to determine the value of the stock options granted during the nine months ended September 29, 2018 and September 30, 2017 are as follows:
|  | Nine Months Ended |
Options Issued and Significant Assumptions Used to Estimate Option Fair Values |  | September 29, 2018 |  |  | September 30, 2017 |
Options issued in thousands |  |  | 147 |  |  |  | 217 |
Risk-free interest rate |  |  | 2.7 | % |  |  | 2.2 | %
Expected life in years |  |  | 6 |  |  |  | 6 |
Expected volatility |  |  | 23.2 | % |  |  | 23.0 | %
Expected dividends |  |  | — |  |  |  | — |
|  | Nine Months Ended |
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant |  | September 29, 2018 |  |  | September 30, 2017 |
Exercise price |  | $ | 205.37 |  |  | $ | 151.24 |
Fair value |  | $ | 57.99 |  |  | $ | 40.49 |
Stock Options Outstanding Roll Forward | The following table summarizes stock option activity for the plans for the nine months ended September 29, 2018 (in thousands, except per share data):
|  | Number of Shares |  |  | Exercise Price per Share |  |  | Weighted-Average Exercise Price per Share |
Outstanding at December 31, 2017 |  |  | 2,039 |  |  | $ | 38.09 |  |  |  | to |  |  | $ | 194.26 |  |  | $ | 124.41 |
Granted |  |  | 147 |  |  | $ | 188.26 |  |  |  | to |  |  | $ | 208.47 |  |  | $ | 205.37 |
Exercised |  |  | (357 | ) |  | $ | 38.09 |  |  |  | to |  |  | $ | 154.33 |  |  | $ | 102.44 |
Canceled |  |  | (137 | ) |  | $ | 98.21 |  |  |  | to |  |  | $ | 154.33 |  |  | $ | 126.13 |
Outstanding at September 29, 2018 |  |  | 1,692 |  |  | $ | 38.09 |  |  |  | to |  |  | $ | 208.47 |  |  | $ | 135.94 |
Restricted Stock Units Unvested Roll Forward | The following table summarizes the unvested restricted stock unit award activity for the nine months ended September 29, 2018 (in thousands, except per share data):
|  | Shares |  |  | Weighted-Average Fair Value per Share |
Unvested at December 31, 2017 |  |  | 374 |  |  | $ | 124.81 |
Granted |  |  | 91 |  |  | $ | 207.85 |
Vested |  |  | (123 | ) |  | $ | 117.68 |
Forfeited |  |  | (18 | ) |  | $ | 126.43 |
Unvested at September 29, 2018 |  |  | 324 |  |  | $ | 150.75 |
Relevant Data Used to Determine the Value of Performance Shares | The relevant data used to determine the value of the performance stock units granted during the nine months ended September 29, 2018 and September 30, 2017 are as follows:
|  | Nine Months Ended |
Performance Stock Units Issued and Significant Assumptions Used to Estimate Fair Values |  | September 29, 2018 |  |  | September 30, 2017 |
Performance stock units issued (in thousands) |  |  | 16 |  |  |  | 20 |
Risk-free interest rate |  |  | 2.0 | % |  |  | 1.5 | %
Expected life in years |  |  | 2.8 |  |  |  | 3.0 |
Expected volatility |  |  | 23.4 | % |  |  | 23.2 | %
Average volatility of peer companies |  |  | 25.8 | % |  |  | 26.1 | %
Correlation coefficient |  |  | 37.2 | % |  |  | 38.5 | %
Expected dividends |  |  | — |  |  |  | — |
Performance Stock Units Unvested Roll Forward | The following table summarizes the unvested performance stock unit award activity for the nine months ended September 29, 2018 (in thousands, except per share data):
|  | Shares |  |  | Weighted-Average Fair Value per Share |
Unvested at December 31, 2017 |  |  | 64 |  |  | $ | 196.29 |
Granted |  |  | 16 |  |  | $ | 253.44 |
Forfeited |  |  | (5 | ) |  | $ | 188.45 |
Unvested at September 29, 2018 |  |  | 75 |  |  | $ | 209.00 |

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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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