Information about Operating Segments and Geographic Areas - Profit and Loss Information of Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 26,797	$ 22,467	$ 22,738	$ 25,439	$ 25,028	$ 26,435	$ 28,873	$ 26,265	$ 97,441	$ 106,601
Cost of revenue									81,621	86,131
Gross profit	3,954	3,677	3,893	4,296	4,916	4,873	5,232	5,449	15,820	20,470
Operating expenses									16,978	14,039
Other income (expense), net									247	132
Income tax expense									(141)	(470)
Net income (loss)	$ (1,261)	$ (106)	$ (185)	$ 500	$ 1,140	$ 1,245	$ 1,885	$ 1,823	(1,052)	6,093
Software [Member]
Segment Reporting Information [Line Items]
Revenue									82,170	86,208
Cost of revenue									68,182	70,937
Gross profit									13,988	15,271
Professional Engineering Services [Member]
Segment Reporting Information [Line Items]
Revenue									15,271	20,393
Cost of revenue									13,439	15,194
Gross profit									$ 1,832	$ 5,199