Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 3,090	$ 8,886
Operating expenses:
Total cost of revenue	1,398	8,564
Gross profit	1,692	322
Research and development expense	9,840	18,661
Sales, marketing, general and administrative expense	5,917	8,133
Gain on disposal of fixed assets	(450)
Total operating expenses	15,307	26,794
Loss from operations	(13,615)	(26,472)
Other expense, net	(19)	(11)
Net loss	$ (13,634)	$ (26,483)
Net loss per share - basic and diluted	$ (0.10)	$ (0.24)
Weighted-average shares outstanding - basic and diluted	139,829,000	111,297,000
Product revenue
Revenue from Contract with Customer, Including Assessed Tax	$ 1,347	$ 5,345
Operating expenses:
Cost of Goods and Services Sold	1,394	6,692
License and royalty
Revenue from Contract with Customer, Including Assessed Tax	1,718	99
Contract
Revenue from Contract with Customer, Including Assessed Tax	25	3,442
Operating expenses:
Cost of Goods and Services Sold	$ 4	$ 1,872