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Deferred Revenue and Other Contract Liabilities - Changes in Deferred Revenue (Details)
$ in Thousands
6 Months Ended
Jun. 29, 2019
USD ($)
Movement in Deferred Revenue [Roll Forward]  
Deferred revenue, beginning of the period $ 10,883
Revenue deferred during the period 5,780
Recognition of revenue deferred in prior periods (2,838)
Deferred revenue, end of the period $ 13,825