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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Reconciliation of the changes in the Company's deferred revenue balance    
Balance, beginning of period $ 2,520 [1] $ 1,383
Additions to deferral 372 280
Revenue recognized (647) (302)
Balance, end of period $ 2,245 $ 1,361
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 30, 2017.