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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 2018 and July 1, 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 |  |  | Six Months Ended |
|  | June 30, 2018 |  |  | July 1, 2017 |  |  | June 30, 2018 |  |  | July 1, 2017 |
Cost of sales |  | $ | 603 |  |  | $ | 787 |  |  | $ | 1,208 |  |  | $ | 1,525 |
Selling and administrative expenses |  |  | 7,639 |  |  |  | 7,602 |  |  |  | 16,123 |  |  |  | 14,790 |
Research and development expenses |  |  | 837 |  |  |  | 750 |  |  |  | 1,640 |  |  |  | 1,479 |
Total stock-based compensation |  | $ | 9,079 |  |  | $ | 9,139 |  |  | $ | 18,971 |  |  | $ | 17,794 |
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 six months ended June 30, 2018 and July 1, 2017 are as follows:
|  | Six Months Ended |
Options Issued and Significant Assumptions Used to Estimate Option Fair Values |  | June 30, 2018 |  |  | July 1, 2017 |
Options issued in thousands |  |  | 140 |  |  |  | 207 |
Risk-free interest rate |  |  | 2.7 | % |  |  | 2.2 | %
Expected life in years |  |  | 6 |  |  |  | 6 |
Expected volatility |  |  | 0.232 |  |  |  | 0.232 |
Expected dividends |  |  | — |  |  |  | — |
|  | Six Months Ended |
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant |  | June 30, 2018 |  |  | July 1, 2017 |
Exercise price |  | $ | 205.97 |  |  | $ | 149.74 |
Fair value |  | $ | 58.26 |  |  | $ | 40.39 |
Stock Options Outstanding Roll Forward | The following table summarizes stock option activity for the plans for the six months ended June 30, 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 |  |  | 140 |  |  | $ | 192.62 to $208.47 |  |  | $ | 205.97 |
Exercised |  |  | (305 | ) |  | $ | 38.09 to $154.33 |  |  | $ | 101.09 |
Canceled |  |  | (137 | ) |  | $ | 98.21 to $154.33 |  |  | $ | 126.04 |
Outstanding at June 30, 2018 |  |  | 1,737 |  |  | $ | 38.09 to $208.47 |  |  | $ | 134.95 |
Restricted Stock Units Unvested Roll Forward | The following table summarizes the unvested restricted stock unit award activity for the six months ended June 30, 2018 (in thousands, except per share data):
|  | Shares |  |  | Weighted-Average Fair Value per Share |
Unvested at December 31, 2017 |  |  | 374 |  |  | $ | 124.81 |
Granted |  |  | 88 |  |  | $ | 208.26 |
Vested |  |  | (116 | ) |  | $ | 117.35 |
Forfeited |  |  | (12 | ) |  | $ | 118.07 |
Unvested at June 30, 2018 |  |  | 334 |  |  | $ | 149.63 |
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 six months ended June 30, 2018 and July 1, 2017 are as follows:
|  | Six Months Ended |
Performance Stock Units Issued and Significant Assumptions Used to Estimate Fair Values |  | June 30, 2018 |  |  | July 1, 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 |  |  | 0.234 |  |  |  | 0.232 |
Average volatility of peer companies |  |  | 0.258 |  |  |  | 0.261 |
Correlation coefficient |  |  | 0.372 |  |  |  | 0.385 |
Expected dividends |  |  | — |  |  |  | — |
Performance Stock Units Unvested Roll Forward | The following table summarizes the unvested performance stock unit award activity for the six months ended June 30, 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 June 30, 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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