Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue, net, including related parties (Note 17)	$ 11,371	$ 11,934
Operating expenses:
Cost of goods sold	6,682	6,492
Research and development	5,584	8,146
Sales and marketing	2,174	2,609
General and administrative	10,328	6,606
Total operating expenses	24,768	23,853
Loss from operations	(13,397)	(11,919)
Interest expense	760	758
Loss in joint venture	6,836	3,703
Changes in fair value of promissory note	(927)	167
Other income, net	(2,157)	(1,264)
Loss before tax expense	(17,909)	(15,283)
Tax expense	0	0
Net loss	$ (17,909)	$ (15,283)
Net loss per share - basic and diluted (in usd per share)	$ (0.56)	$ (0.54)
Weighted average common shares outstanding - basic and diluted (in shares)	31,739,801	28,153,605