Intangible Assets - Schedule of Acquired Intangible Assets by Major Asset Class (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross	$ 882	$ 1,353
Accumulated amortization	(202)	(197)
Net book value before impairment		1,156
Impairment charge		(411)
Net book value	680	745
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	265	265
Accumulated amortization	(43)	(32)
Net book value before impairment		233
Net book value	$ 222	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	(132)	(147)
Net book value before impairment		852
Impairment charge		(411)
Net book value	$ 396	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	(14)	(9)
Net book value before impairment		29
Net book value	$ 24	29
Non-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Gross	$ 51	51
Accumulated amortization	(13)	(9)
Net book value before impairment		42
Net book value	$ 38	$ 42