Stock Based Compensation - Summary of Activity in Stock Option Plan (Details) - 6 months ended Jul. 04, 2015 - USD ($) $ / shares in Units, $ in Thousands	Total
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Outstanding, Number of Shares, Beginning Balance	833,795
Number of Shares, Options Granted	95,700
Number of Shares, Options Exercised	(167,189)
Number of Shares, Options Cancelled or forfeited	(18,351)
Outstanding, Number of Shares, Ending Balance	743,955
Weighted Average Exercise Price Per Share, Beginning Balance	$ 4.88
Weighted Average Exercise Price Per Share , Options Granted	10.62
Weighted Average Exercise Price Per Share, Options Exercised	3.68
Weighted Average Exercise Price Per Share, Options Cancelled or forfeited	5.98
Weighted Average Exercise Price Per Share, Ending Balance	$ 5.86
Aggregate Intrinsic Value, Ending Balance	$ 2,048

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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