CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cost of revenue	$ 8,432	$ 7,330
Gross profit	9,072	6,234
Operating expenses:
Research and development	13,440	9,437
Selling, general and administrative	16,161	13,607
Total operating expenses	29,601	23,044
Loss from operations	(16,068)	(13,355)
Non-operating expense, net:
Foreign exchange (loss) gain	(162)	108
Interest expense	(2,924)	(915)
Other income, net	422	331
Total non-operating expense, net	(2,664)	(476)
Loss before income taxes	(18,732)	(13,831)
Provision for income taxes	60	54
Net loss	$ (18,792)	$ (13,885)
Net loss per share:
Basic	$ (0.14)	$ (0.11)
Diluted	$ (0.14)	$ (0.11)
Weighted average shares outstanding used for calculating net loss per share:
Basic	137,108	124,814
Diluted	137,108	124,814
Product
Revenue	$ 17,504	$ 13,564
Government Contract
Revenue	$ 4,461	$ 3,455