Summary of Significant Accounting Policies - Recent Issued Accounting Standards (Details) - USD ($) $ in Thousands	Mar. 29, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 12,671	$ 13,100
Lease liabilities	$ 12,523
ASU 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use assets		13,100
Lease liabilities		$ 13,000