Discontinued Operations - Schedule of Discontinued Operations within Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 368	$ 3,795	$ 3,725	$ 8,621
Cost of revenues	415	3,113	3,974	8,044
Gross profit	(47)	682	(249)	577
Operating expenses:
Sales and marketing	51	280	400	855
General and administrative	4	43	31	126
Amortization of intangible assets	0	126	0	1,022
Impairment of intangible assets	0	0	0	4,724
Restructuring expenses	0	96	8	420
Total operating expenses	55	545	439	7,147
Operating (loss) income	(102)	137	(688)	(6,570)
Gain on sale	(503)	0	(503)	0
Net (loss) income before income taxes	401	137	(185)	(6,570)
Expense (benefit) for income taxes	165	51	(37)	(2,445)
Net (loss) income	$ 236	$ 86	$ (148)	$ (4,125)