CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 15,399	$ 10,797	$ 44,383	$ 27,328
Cost of revenue	8,142	5,348	23,192	13,402
Gross profit	7,257	5,449	21,191	13,926
Operating expenses:
Research and development	10,825	7,886	30,143	25,927
Selling, general and administrative	13,964	12,230	42,008	40,058
Total operating expenses	24,789	20,116	72,151	65,985
Loss from operations	(13,604)	(12,382)	(39,530)	(46,679)
Non-operating (expense) income, net:
Foreign exchange gain (loss)	8		(22)	(59)
Interest expense	(1,053)	(1,090)	(2,926)	(2,122)
Other income, net	513	104	1,288	3,722
Total non-operating (expense) income, net	(532)	(986)	(1,660)	1,541
Loss before income taxes	(14,136)	(13,368)	(41,190)	(45,138)
Provision for income taxes	56	50	169	3,961
Net loss	$ (14,192)	$ (13,418)	$ (41,359)	$ (49,099)
Net loss per share:
Basic	$ (0.11)	$ (0.12)	$ (0.32)	$ (0.46)
Diluted	$ (0.11)	$ (0.12)	$ (0.32)	$ (0.46)
Weighted average shares outstanding used for calculating net loss per share:
Basic	134,326	109,846	130,199	106,159
Diluted	134,326	109,846	130,199	106,159
Product
Revenue	$ 15,399	$ 10,797	$ 44,383	$ 27,328
Government Contract
Revenue	$ 3,928	$ 2,285	$ 11,430	$ 5,380