Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)

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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 27, 2018
Dec. 28, 2017
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 243,563 $ 119,550  
Additional paid-in capital 340,462 323,419  
Deferred revenue $ 5,244 22,523  
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings   7,800  
Deferred revenue   $ (7,800)  
Restatement Adjustment [Member] | Accounting Standards Update 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings     $ (148)
Additional paid-in capital     $ 238