Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue:
Product revenue	$ 31,156	$ 30,671	$ 59,487	$ 62,215
Service revenue	11,558	12,453	22,000	23,227
Total revenue	42,714	43,124	81,487	85,442
Cost of Revenue:
Cost of product	20,072	19,210	37,835	40,112
Cost of services	7,550	9,132	14,684	17,297
Total cost of revenue	27,622	28,342	52,519	57,409
Gross profit	15,092	14,782	28,968	28,033
Operating expenses:
Product development and engineering	5,310	5,392	10,435	10,970
Selling, general and administrative	8,979	10,516	18,541	22,038
Total operating expenses	14,289	15,908	28,976	33,008
Operating Income (loss)	803	(1,126)	(8)	(4,975)
Interest expense	(50)	(40)	(99)	(190)
Other expense, net	(281)	(420)	(301)	(387)
Income (loss) before provision for income taxes	472	(1,586)	(408)	(5,552)
Provision for income taxes	752	681	940	932
Net Loss	$ (280)	$ (2,267)	$ (1,348)	$ (6,484)
Net loss per share — basic (in usd per share)	$ (0.04)	$ (0.31)	$ (0.19)	$ (0.89)
Net loss per share — diluted (in usd per share)	$ (0.04)	$ (0.31)	$ (0.19)	$ (0.89)
Weighted average number of shares:
Basic (in shares)	6,988	7,360	7,059	7,322
Diluted (in shares)	6,988	7,360	7,059	7,322