Intangible Assets - Schedule of Acquired Intangible Assets by Major Asset Class (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross	$ 882	$ 1,353
Accumulated amortization	(331)	(197)
Net book value before impairment		1,156
Impairment charge		(411)
Net book value	551	745
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	265	265
Accumulated amortization	(66)	(32)
Net book value before impairment		233
Net book value	$ 199	233
Purchased Technology [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years
Purchased Technology [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	6 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 528	999
Accumulated amortization	(220)	(147)
Net book value before impairment		852
Impairment charge		(411)
Net book value	$ 308	441
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	6 years
Trademarks/Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	2 years
Gross	$ 38	38
Accumulated amortization	(24)	(9)
Net book value before impairment		29
Net book value	$ 14	29
Non-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Gross	$ 51	51
Accumulated amortization	(21)	(9)
Net book value before impairment		42
Net book value	$ 30	$ 42