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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Sep. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Feb. 15, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Cash and cash equivalents $ 12,431         $ 11,170
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      
Fair value of the remaining contingent consideration liability 1,500          
Soft Company [Member] | Other Current Liabilities [Member]            
Business Acquisition [Line Items]            
Fair value of the remaining contingent consideration liability 1,100          
Soft Company [Member] | Other Long-Term Liabilities [Member]            
Business Acquisition [Line Items]            
Fair value of the remaining contingent consideration liability 400          
Soft Company [Member] | Selling General and Administrative Expenses [Member]            
Business Acquisition [Line Items]            
Acquisition related costs $ 100 $ 500