Stock Based Compensation - Summary of Activity in Stock Option Plan (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Number of Shares, Beginning Balance	1,102,842
Number of Shares, Options Granted	127,500
Number of Shares, Options Exercised	(209,610)
Number of Shares, Options Cancelled or forfeited	(25,696)
Outstanding, Number of Shares, Ending Balance	995,036
Weighted Average Exercise Price Per Share, Beginning Balance	$ 3.97
Weighted Average Exercise Price Per Share , Options Granted	$ 8.72
Weighted Average Exercise Price Per Share, Options Exercised	$ 4.05
Weighted Average Exercise Price Per Share, Options Cancelled or forfeited	$ 6.28
Weighted Average Exercise Price Per Share, Ending Balance	$ 4.50
Aggregate Intrinsic Value, Ending Balance	$ 3,821

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

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

+ References

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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