Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 1,851	$ 2,188
Operating expenses:
Total cost of revenue	1,243	1,873
Gross profit	608	315
Research and development expense	5,973	4,828
Sales, marketing, general and administrative expense	2,699	2,607
Total operating expenses	8,672	7,435
Loss from operations	(8,064)	(7,120)
Other expense, net	(4)	(12)
Net loss	$ (8,068)	$ (7,132)
Net loss per share - basic and diluted	$ (0.08)	$ (0.09)
Weighted-average shares outstanding - basic and diluted	101,971	78,610
Product revenue
Revenue from Contract with Customer, Including Assessed Tax	$ 199	$ 0
Operating expenses:
Cost of Goods and Services Sold	288	238
License and royalty
Revenue from Contract with Customer, Including Assessed Tax	0	11
Contract
Revenue from Contract with Customer, Including Assessed Tax	1,652	2,177
Operating expenses:
Cost of Goods and Services Sold	$ 955	$ 1,635