Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 85,558	$ 85,592
Accumulated Amortization	(76,918)	(72,775)
Total future amortization expense	$ 8,640	12,817
Developed Core Technology
Finite-Lived Intangible Assets [Line Items]
Useful Life	8 months 12 days
Gross Carrying Amount	$ 31,708	31,707
Accumulated Amortization	(28,167)	(25,576)
Total future amortization expense	$ 3,541	6,131
Customer relationships/contracts
Finite-Lived Intangible Assets [Line Items]
Useful Life	1 year 8 months 12 days
Gross Carrying Amount	$ 44,628	44,650
Accumulated Amortization	(39,632)	(38,146)
Total future amortization expense	$ 4,996	6,504
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Useful Life	8 months 12 days
Gross Carrying Amount	$ 618	623
Accumulated Amortization	(515)	(441)
Total future amortization expense	103	182
Maintenance Agreements and Related Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,500	5,500
Accumulated Amortization	(5,500)	(5,500)
Total future amortization expense	0	0
Order Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,104	3,112
Accumulated Amortization	(3,104)	(3,112)
Total future amortization expense	$ 0	$ 0