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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($)
$ in Thousands
Jun. 28, 2019
Dec. 31, 2018
Feb. 15, 2018
Business Acquisition [Line Items]      
Cash and cash equivalents $ 11,290 $ 12,431  
Soft Company [Member]      
Business Acquisition [Line Items]      
Business acquisition, percentage acquired 100.00%   100.00%