Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue, net, including related parties (Note 11)	$ 6,329	$ 488	$ 7,429	$ 1,017
Operating expenses:
Cost of goods sold	1,248	1,182	2,703	2,586
Research and development	1,594	2,022	3,060	4,204
Sales and marketing	528	675	1,046	1,526
General and administrative	2,058	1,494	5,150	2,745
Total operating expenses	5,428	5,373	11,959	11,061
Income (loss) from operations	901	(4,885)	(4,530)	(10,044)
Interest expense	189	189	378	376
Loss in joint venture	1,856	1,100	3,275	2,227
Changes in fair value of promissory note	1,658	51	(663)	84
Other income, net	(532)	(324)	(1,063)	(460)
Loss before tax expense	(2,270)	(5,901)	(6,457)	(12,271)
Tax expense	0	0	0	0
Net loss	$ (2,270)	$ (5,901)	$ (6,457)	$ (12,271)
Net loss per share - basic and diluted (in usd per share)	$ (0.06)	$ (0.21)	$ (0.19)	$ (0.44)
Weighted average common shares outstanding - basic and diluted (in shares)	35,135,520	28,153,555	33,523,844	28,153,555