Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Change in goodwill	$ 0
Goodwill	3,332,000		$ 3,332,000
Amortization of intangible assets	290,000	$ 290,000
Increase (decrease) in cost of intangible assets	300,000
Operating Expense [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	100,000	100,000
Cost of Revenues [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 200,000	$ 200,000
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives	1 year
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives	6 years
RF Solutions [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 3,300,000