Balance Sheet Components - Schedule of Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Dec. 31, 2019
Other Liabilities Current [Abstract]
Contingent consideration - acquisitions		$ 569
Income tax payable	$ 4,109	2,783
Current operating lease obligations	$ 4,470	$ 4,906
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	onto:OperatingLeaseLiabilityCurrentMember	onto:OperatingLeaseLiabilityCurrentMember
Customer deposits	$ 15,177	$ 1,994
Accrued professional fees	1,184	1,520
Other	3,559	7,400
Total other current liabilities	$ 28,499	$ 19,172