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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Roll forward of the accounts receivable allowance      
Balance at beginning of period $ 3,648    
Increases to reserves 666 $ (480) $ (2,996)
Balance at end of period 4,253 3,648  
Billed Revenues      
Roll forward of the accounts receivable allowance      
Balance at beginning of period 3,648 4,177  
Increases to reserves 2,761 2,361  
Amounts written off (2,156) (2,881)  
Effects of foreign currency translation   (9)  
Balance at end of period 4,253 3,648 4,177
Unbilled Revenues      
Roll forward of the accounts receivable allowance      
Balance at beginning of period 2,354 2,233  
Increases to reserves 2,102 2,832  
Amounts written off (2,736) (2,711)  
Balance at end of period $ 1,720 $ 2,354 $ 2,233