Information about Geographic Areas and Operating Segments - Summarized Financial Information of Operating and Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 22,467	$ 26,435	$ 70,644	$ 81,573
Cost of revenue	18,790	21,562	58,778	66,019
Gross profit (loss)	3,677	4,873	11,866	15,554
Operating expenses	4,092	3,486	11,717	10,420
Other income, net	128	32	204	124
Income tax benefit (expense)	181	(174)	(144)	(305)
Net income (loss)	(106)	1,245	209	4,953
Software [Member]
Segment Reporting Information [Line Items]
Revenue	19,216	21,215	58,118	66,679
Cost of revenue	15,281	17,698	47,901	54,732
Gross profit (loss)	3,935	3,517	10,217	11,947
Professional Engineering Services [Member]
Segment Reporting Information [Line Items]
Revenue	3,251	5,220	12,526	14,894
Cost of revenue	3,509	3,864	10,877	11,287
Gross profit (loss)	$ (258)	$ 1,356	$ 1,649	$ 3,607