Segment and Geographic Information - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 193,286	$ 232,221	$ 211,264	$ 169,567	$ 182,922	$ 266,042	$ 178,080	$ 139,039	$ 806,338	$ 766,083	$ 529,515
Long-lived assets	95,321				80,539				95,321	80,539	56,311
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									231,760	180,248	142,380
Long-lived assets	67,156				53,983				67,156	53,983	40,404
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									307,965	328,826	230,311
Long-lived assets	23,948				22,437				23,948	22,437	12,981
Greater China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									126,109	108,738	66,179
Long-lived assets	1,482				1,594				1,482	1,594	994
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									140,504	148,271	90,645
Long-lived assets	$ 2,735				$ 2,525				$ 2,735	$ 2,525	$ 1,932