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Stockholders' Equity and Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Employee stock purchase plan assumptions |
|  | Six Months Ended |
|  | June 30, 2018 |  |  | July 1, 2017 |
Employee Stock Purchase Plan: |  |  |  |  |  |  |  |
Expected life |  | 0.5 years |  |  | 0.5 years |
Volatility |  | 27.2% |  |  | 35.2% |
Risk free interest rate |  | 1.61% |  |  | 0.65% |
Dividends |  | — |  |  | — |
Stock option plans activity | A summary of activity of stock options during the six months ended June 30, 2018 is as follows:
|  | Number of Shares Outstanding (Options) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value (in Thousands) |
Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 30, 2017 |  |  | 216,326 |  |  | $ | 16.82 |  |  |  | 1.76 |  |  | $ | 4,405 |
Exercised |  |  | (72,602 | ) |  |  | 16.57 |  |  |  |  |  |  |  |  |
Cancelled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2018 |  |  | 143,724 |  |  |  | 16.94 |  |  |  | 1.28 |  |  |  | 2,654 |
Exercisable at June 30, 2018 |  |  | 143,724 |  |  | $ | 16.94 |  |  |  | 1.28 |  |  | $ | 2,654 |
Summary of activity for RSUs | A summary of activity for RSUs during the six months ended June 30, 2018 is as follows:
Summary of activity for RSUs |  | Number of RSUs |  |  | Weighted Average Fair Value |
Outstanding RSUs as of December 30, 2017 |  |  | 790,299 |  |  | $ | 22.46 |
Granted |  |  | 387,089 |  |  |  | 36.57 |
Released |  |  | (288,145 | ) |  |  | 20.62 |
Cancelled |  |  | (110,294 | ) |  |  | 24.50 |
Outstanding RSUs as of June 30, 2018 |  |  | 778,949 |  |  | $ | 29.86 |
Summary of activity for PSUs | A summary of activity for PSUs for the six months ended June 30, 2018 is as follows:
Summary of activity for PSUs |  | Number of PSUs |  |  | Weighted Average Fair Value |
Outstanding PSUs as of December 30, 2017 |  |  | 129,950 |  |  | $ | 15.60 |
Granted |  |  | 63,133 |  |  |  | 24.54 |
Released |  |  | (47,929 | ) |  |  | 12.14 |
Cancelled |  |  | (32,991 | ) |  |  | 25.92 |
Outstanding PSUs as of June 30, 2018 |  |  | 112,163 |  |  | $ | 19.25 |
PSUs valuation assumptions | The assumptions for the valuation of PSUs are summarized as follows:
|  | 2018 Award |  |  | 2017 Award |
Grant Date Fair Value Per Share |  | $20.73-$25.18 |  |  | $ | 26.75 |
Weighted-average assumptions/inputs: |  |  |  |  |  |  |  |
Expected Dividend |  |  | — |  |  |  | — |
Range of risk-free interest rates |  | 2.39%-2.63% |  |  | 1.40% |
Range of expected volatilities for peer group |  | 22%-66% |  |  | 23%-62% |
Stock-based compensation expense for all share-based payment awards | Stock-based compensation expense for all share-based payment awards made to the Company’s employees and directors pursuant to the employee stock option and employee stock purchase plans by function were as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2018 |  |  | July 1, 2017 |  |  | June 30, 2018 |  |  | July 1, 2017 |
Cost of products |  | $ | 133 |  |  | $ | 215 |  |  | $ | 231 |  |  | $ | 412 |
Cost of service |  |  | 186 |  |  |  | 157 |  |  |  | 341 |  |  |  | 302 |
Research and development |  |  | 506 |  |  |  | 355 |  |  |  | 983 |  |  |  | 754 |
Selling |  |  | 737 |  |  |  | 528 |  |  |  | 1,270 |  |  |  | 1,067 |
General and administrative |  |  | 1,117 |  |  |  | 908 |  |  |  | 2,192 |  |  |  | 1,792 |
Total stock-based compensation expense related to employee stock options and employee stock purchases |  | $ | 2,679 |  |  | $ | 2,163 |  |  | $ | 5,017 |  |  | $ | 4,327 |

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- Definition Schedule of Share-based Payment Award, Equity Instruments Other Than Stock Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
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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://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=109197908&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=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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=109197908&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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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