Stockholders' Equity and Share-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands |
3 Months Ended | |
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Mar. 31, 2018 |
Apr. 01, 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Number of stock options granted (in shares) | 554 | |
| Number of options exercised (in shares) | 0 | |
| Number of stock options forfeited (in shares) | 9 | |
| Number of stock options expired (in shares) | 42 | |
| Time Based RSU | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Vested (in shares) | 307 | |
| Performance based RSU | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Vested (in shares) | 131 | |
| Restricted stock units | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Vested (in shares) | 438 | |
| Shares withheld to satisfy employee tax obligations (in shares) | 166 | |
| Adjustment related employee tax obligations | $ 395 | |
| Compensation expense | 1,003 | $ 1,113 |
| Unrecognized compensation expense | $ 6,685 | |
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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. No definition available.
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Gross number of share options (or share units) granted during the period. No definition available.
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. No definition available.
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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