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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 29, 2018
Mar. 30, 2018
Feb. 15, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]              
Cash and cash equivalents $ 9,718 $ 9,718     $ 11,170 $ 11,523 $ 9,407
Soft Company [Member]              
Business Acquisition [Line Items]              
Business acquisition, percentage acquired     100.00% 100.00%      
Fair value of acquisition       $ 2,000      
Earn-out contingency liability 900 900          
Soft Company [Member] | Other Long-Term Liabilities [Member]              
Business Acquisition [Line Items]              
Fair value of the remaining contingent consideration liability $ 900 $ 900