Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Total revenue	$ 19,203	$ 18,848	$ 39,881	$ 41,689
Cost of revenue:
Total cost of revenue	15,942	14,975	31,420	31,563
Gross profit	3,261	3,873	8,461	10,126
Operating expenses:
Selling, general and administrative	4,901	5,046	10,349	9,911
Research and development	2,078	1,446	4,308	2,793
Total operating expenses	6,979	6,492	14,657	12,704
Loss from operations	(3,718)	(2,619)	(6,196)	(2,578)
Other income, net	47	59	91	114
Loss before income taxes	(3,671)	(2,560)	(6,105)	(2,464)
Income tax benefit (expense)	(12)		(12)	106
Net loss	$ (3,683)	$ (2,560)	$ (6,117)	$ (2,358)
Basic loss per share	$ (0.29)	$ (0.20)	$ (0.48)	$ (0.19)
Diluted loss per share	$ (0.29)	$ (0.20)	$ (0.48)	$ (0.19)
Shares used in per share calculations:
Basic	12,697	12,577	12,685	12,563
Diluted	12,697	12,577	12,685	12,563
Net loss	$ (3,683)	$ (2,560)	$ (6,117)	$ (2,358)
Other comprehensive income
Foreign currency translation, net of tax	21	14	10	22
Unrealized gain (loss) on investments, net of tax	(8)	(2)	2	3
Total other comprehensive income	13	12	12	25
Comprehensive loss	(3,670)	(2,548)	(6,105)	(2,333)
Third Party Software [Member]
Revenue:
Total revenue	16,992	15,505	33,056	32,302
Cost of revenue:
Total cost of revenue	14,480	13,103	27,834	27,185
Gross profit	2,512	2,402	5,222	5,117
Proprietary Software [Member]
Revenue:
Total revenue	281	481	2,076	3,135
Cost of revenue:
Total cost of revenue	100	39	141	71
Gross profit	181	442	1,935	3,064
Professional Engineering Service [Member]
Revenue:
Total revenue	1,930	2,862	4,749	6,252
Cost of revenue:
Total cost of revenue	1,362	1,833	3,445	4,307
Gross profit	$ 568	$ 1,029	$ 1,304	$ 1,945