CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cost of revenue	$ 8,320	$ 8,432
Gross profit	10,291	9,072
Operating expenses:
Research and development	15,810	13,440
Selling, general and administrative	15,913	16,161
Total operating expenses	31,723	29,601
Loss from operations	(15,402)	(16,068)
Non-operating expense, net:
Foreign exchange loss	(223)	(162)
Interest expense	(935)	(2,924)
Other income, net	151	422
Total non-operating expense, net	(1,007)	(2,664)
Loss before income taxes	(16,409)	(18,732)
Provision for income taxes	57	60
Net loss	$ (16,466)	$ (18,792)
Net loss per share:
Basic and diluted	$ (0.10)	$ (0.14)
Weighted average shares used for calculating net loss per share:
Basic and diluted	157,405	137,108
Product
Revenue	$ 18,611	$ 17,504
Government Contract
Revenue	$ 6,030	$ 4,461