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Share-based Compensation (Tables) | 9 Months Ended
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Sep. 28, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Share-Based Compensation Expense Recorded in the Consolidated Statements of Operations | The table below summarizes share-based compensation expense recorded in the consolidated statements of operations (in thousands):
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Selling, general and administrative | $ | 1,523 |  |  | $ | 1,336 |  |  | $ | 5,021 |  |  | $ | 3,911 |
Research and development and engineering |  | 114 |  |  |  | 59 |  |  |  | 306 |  |  |  | 156 |
Cost of revenue |  | 58 |  |  |  | 41 |  |  |  | 148 |  |  |  | 156 |
Total share-based compensation expense | $ | 1,695 |  |  | $ | 1,436 |  |  | $ | 5,475 |  |  | $ | 4,223 |
Fair Value of TSR Performance-Based Restricted Stock Units Estimated Using Monte-Carol Valuation Model | The fair value of the TSR-PSUs at the date of grant was estimated using the Monte-Carlo valuation model with the following assumptions:
| Nine Months Ended September 28, 2018 |
Grant-date stock price | $ | 53.85 |
Expected volatility |  | 30.35 | %
Risk-free interest rate |  | 2.37 | %
Expected annual dividend yield |  | — |
Fair value | $ | 70.49 |
2010 Incentive Award Plan |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Restricted Stock Issued and Outstanding | The table below summarizes activities relating to RSUs and DSUs issued and outstanding under the Company’s Amended and Restated 2010 Incentive Plan during the nine months ended September 28, 2018:
| Shares (In thousands) |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2017 |  | 614 |  |  | $ | 18.35 |
Granted |  | 123 |  |  | $ | 54.36 |
Vested |  | (186 | ) |  | $ | 18.52 |
Forfeited |  | (27 | ) |  | $ | 24.53 |
Unvested at September 28, 2018 |  | 524 |  |  | $ | 26.39 |
Expected to vest as of September 28, 2018 |  | 500 |  |  |  |  |
Performance-Based Awards Issued and Outstanding | The table below summarizes the activities relating to the performance-based awards issued and outstanding under the Company’s Amended and Restated 2010 Incentive Plan during the nine months ended September 28, 2018:
| Shares (In thousands) |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2017 |  | 89 |  |  | $ | 24.00 |
Granted |  | 48 |  |  | $ | 62.17 |
Vested |  | — |  |  | $ | — |
Forfeited |  | — |  |  | $ | — |
Unvested at September 28, 2018 |  | 137 |  |  | $ | 37.28 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance stock awards with market condition, including, but not limited to: (a) expected term of performance stock awards 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 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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