Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 24,413	$ 35,093	$ 50,603	$ 72,703
Cost of Goods Sold, Product	8,407	17,913	20,715	40,089
Revenue, Product	15,226	26,340	32,868	55,039
Revenue, Service	9,187	8,753	17,735	17,664
Cost of sales:
Cost of Goods Sold, Service	4,927	5,245	9,914	10,530
Amortization of purchased technology	1,927	1,927	3,854	3,854
Total cost of sales	15,261	25,085	34,483	54,473
Gross margin	9,152	10,008	16,120	18,230
Research and development	3,235	5,994	6,921	12,474
Selling, general and administrative	6,454	8,214	13,788	17,596
Intangible asset amortization	198	1,260	396	2,520
Restructuring and acquisition-related charges, net	1,289	1,235	2,860	1,470
Income (loss) from operations	(2,024)	(6,695)	(7,845)	(15,830)
Change in fair value of Warrant liability	(2,355)	0	(503)	0
Interest expense	(1,365)	(224)	(2,795)	(496)
Other income (expense), net	1,434	(130)	1,253	(427)
Income (loss) before income tax expense (benefit)	(4,310)	(7,049)	(9,890)	(16,753)
Income tax expense (benefit)	324	505	1,189	809
Net income (loss)	$ (4,634)	$ (7,554)	$ (11,079)	$ (17,562)
Net income (loss) per share:
Basic (in dollars per share)	$ (0.12)	$ (0.19)	$ (0.28)	$ (0.45)
Diluted (in dollars per share)	$ (0.12)	$ (0.19)	$ (0.28)	$ (0.45)
Weighted average shares outstanding:
Basic (in shares)	39,493	38,966	39,424	38,840
Diluted (in shares)	39,493	38,966	39,424	38,840