Organization and Summary of Significant Accounting Policies - Schedule of Purchased Intangible Assets Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Developed Technology Rights [Member]
Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Estimated useful life	10 years	10 years
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Estimated useful life	12 years	12 years
Order or Production Backlog [Member]
Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Estimated useful life	1 year	1 year
Noncompete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Estimated useful life	5 years	5 years