Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 1,469	$ 1,851
Operating expenses:
Total cost of revenue	1,399	1,243
Gross profit	70	608
Research and development expense	3,683	5,973
Sales, marketing, general and administrative expense	1,771	2,699
Gain on disposal of fixed assets	(450)	0
Total operating expenses	5,004	8,672
Loss from operations	(4,934)	(8,064)
Other expense, net	0	(4)
Net loss	$ (4,934)	$ (8,068)
Net loss per share - basic and diluted	$ (0.04)	$ (0.08)
Weighted-average shares outstanding - basic and diluted	127,214,000	101,971,000
Product revenue
Revenue from Contract with Customer, Including Assessed Tax	$ 1,247	$ 199
Operating expenses:
Cost of Goods and Services Sold	1,395	288
License and royalty
Revenue from Contract with Customer, Including Assessed Tax	212	0
Contract
Revenue from Contract with Customer, Including Assessed Tax	10	1,652
Operating expenses:
Cost of Goods and Services Sold	$ 4	$ 955