Goodwill and Intangible Assets - Schedule of Identifiable Intangible Assets (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,790,000	$ 12,790,000
Accumulated Amortization	(4,812,000)	(3,844,000)
Intangible assets, net	7,978,000	8,946,000
Total intangible assets, gross carrying amount	13,106,000	12,790,000
Total intangible assets, net book value	$ 8,294,000	8,946,000
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	6 years 3 months 18 days
Gross Carrying Amount	$ 11,231,000	11,231,000
Accumulated Amortization	(3,995,000)	(3,118,000)
Intangible assets, net	$ 7,236,000	8,113,000
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	6 years 8 months 12 days
Gross Carrying Amount	$ 1,000,000	1,000,000
Accumulated Amortization	(274,000)	(197,000)
Intangible assets, net	$ 726,000	803,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	6 years 1 month 6 days
Gross Carrying Amount	$ 519,000	519,000
Accumulated Amortization	(503,000)	(496,000)
Intangible assets, net	$ 16,000	23,000
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	2 years
Gross Carrying Amount	$ 40,000	40,000
Accumulated Amortization	(40,000)	(33,000)
Intangible assets, net	0	7,000
internal-use Software [Member]
Finite-Lived Intangible Assets [Line Items]
Internal-use software in development	$ 316,000	$ 0