Segment Information - Summary of Revenue, Property and Equipment, Net by Geographic Region (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Net revenues:
Revenue		$ 122,178	$ 115,725	$ 84,865	$ 80,106	$ 113,655	$ 100,616	$ 99,160	$ 90,127	$ 402,874	[1]	$ 403,558	[1]	$ 358,246	[1]
Property and equipment, net:
Property and equipment, net		22,928				22,321				22,928		22,321
United States
Net revenues:
Revenue	[1]									202,272		181,965		131,773
Property and equipment, net:
Property and equipment, net		13,301				10,376				13,301		10,376
Other countries
Net revenues:
Revenue	[1]									200,602		221,593		$ 226,473
Israel
Property and equipment, net:
Property and equipment, net		5,919				6,975				5,919		6,975
France
Property and equipment, net:
Property and equipment, net		2,615				3,519				2,615		3,519
All countries except United States, Israel and France [Member] [Member]
Property and equipment, net:
Property and equipment, net		$ 1,093				$ 1,451				$ 1,093		$ 1,451

[1] Revenue is attributed to countries based on the location of the customer.