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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-Based Compensation Expense | The consolidated statements of operations for the three months ended March 31, 2018 and April 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):
|  | March 31, 2018 |  |  | April 1, 2017 |
Cost of sales |  | $ | 605 |  |  | $ | 738 |
Selling and administrative expenses |  |  | 8,483 |  |  |  | 7,188 |
Research and development expenses |  |  | 804 |  |  |  | 729 |
Total stock-based compensation |  | $ | 9,892 |  |  | $ | 8,655 |
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 March 31, 2018 and April 1, 2017 are as follows:
|  | Three Months Ended |
Options Issued and Significant Assumptions Used to Estimate Option Fair Values |  | March 31, 2018 |  |  | April 1, 2017 |
Options issued in thousands |  |  | 133 |  |  |  | 207 |
Risk-free interest rate |  |  | 2.7 | % |  |  | 2.2 | %
Expected life in years |  |  | 6 |  |  |  | 6 |
Expected volatility |  |  | 0.232 |  |  |  | 0.232 |
Expected dividends |  |  | — |  |  |  | — |
|  | Three Months Ended |
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant |  | March 31, 2018 |  |  | April 1, 2017 |
Exercise price |  | $ | 206.66 |  |  | $ | 149.74 |
Fair value |  | $ | 58.38 |  |  | $ | 40.39 |
Stock Options Outstanding Roll Forward | The following table summarizes stock option activity for the plans for the three months ended March 31, 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 |  |  | 133 |  |  | $ | 195.69 to $208.47 |  |  | $ | 206.66 |
Exercised |  |  | (222 | ) |  | $ | 38.09 to $154.33 |  |  | $ | 102.43 |
Canceled |  |  | (44 | ) |  | $ | 98.21 to $128.93 |  |  | $ | 119.62 |
Outstanding at March 31, 2018 |  |  | 1,906 |  |  | $ | 38.09 to $208.47 |  |  | $ | 132.82 |
Restricted Stock Units Unvested Roll Forward | The following table summarizes the unvested restricted stock unit award activity for the three months ended March 31, 2018 (in thousands, except per share data):
|  | Shares |  |  | Weighted-Average Fair Value per Share |
Unvested at December 31, 2017 |  |  | 374 |  |  | $ | 124.81 |
Granted |  |  | 87 |  |  | $ | 208.47 |
Vested |  |  | (115 | ) |  | $ | 117.42 |
Forfeited |  |  | (6 | ) |  | $ | 117.26 |
Unvested at March 31, 2018 |  |  | 340 |  |  | $ | 148.85 |
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 three months ended March 31, 2018 and April 1, 2017 are as follows:
|  | Three Months Ended |
Performance Stock Units Issued and Significant Assumptions Used to Estimate Fair Values |  | March 31, 2018 |  |  | April 1, 2017 |
Performance stock units issued (in thousands) |  |  | 15 |  |  |  | 20 |
Risk-free interest rate |  |  | 2.0 | % |  |  | 1.5 | %
Expected life in years |  |  | 2.9 |  |  |  | 3.0 |
Expected volatility |  |  | 0.180 |  |  |  | 0.232 |
Average volatility of peer companies |  |  | 0.258 |  |  |  | 0.261 |
Correlation Coefficient |  |  | 0.374 |  |  |  | 0.385 |
Expected dividends |  |  | — |  |  |  | — |
Performance Stock Units Unvested Roll Forward | The following table summarizes the unvested performance stock unit award activity for the three months ended March 31, 2018 (in thousands, except per share data):
|  | Shares |  |  | Weighted-Average Fair Value per Share |
Unvested at December 31, 2017 |  |  | 64 |  |  | $ | 196.29 |
Granted |  |  | 15 |  |  | $ | 267.64 |
Forfeited |  |  | (3 | ) |  | $ | 181.83 |
Unvested at March 31, 2018 |  |  | 76 |  |  | $ | 210.94 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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