Information about Geographic Areas and Operating Segments - Profit and Loss Information of Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 19,653	$ 22,467	$ 61,342	$ 70,644
Cost of revenue	15,273	18,790	46,836	58,778
Gross profit	4,380	3,677	14,506	11,866
Operating expenses	6,926	4,092	19,630	11,717
Other income, net	34	128	148	204
Income tax benefit (expense)	44	181	150	(144)
Net income (loss)	(2,468)	(106)	(4,826)	209
Software [Member]
Segment Reporting Information [Line Items]
Revenue	17,440	19,216	52,877	58,118
Cost of revenue	13,653	15,281	40,909	47,901
Gross profit	3,787	3,935	11,968	10,217
Professional Engineering Service [Member]
Segment Reporting Information [Line Items]
Revenue	2,213	3,251	8,465	12,526
Cost of revenue	1,620	3,509	5,927	10,877
Gross profit	$ 593	$ (258)	$ 2,538	$ 1,649