Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Total revenue	$ 2,196	$ 3,313	$ 4,513	$ 7,340
Cost of revenue:
Total cost of revenue	1,460	2,375	2,919	5,077
Operating expenses:
Research and development	2,304	2,174	7,379	6,682
Selling, general and administrative	8,659	4,449	21,640	14,295
Total operating expenses	10,963	6,623	29,019	20,977
Loss from operations	(10,227)	(5,685)	(27,425)	(18,714)
Other expenses:
Interest expense	(589)	(578)	(1,911)	(1,613)
Loss on debt extinguishment	0	0	0	(1,333)
Other expenses	54	(131)	0	(241)
Total other expenses	(535)	(709)	(1,911)	(3,187)
Loss before income taxes	(10,762)	(6,394)	(29,336)	(21,901)
Provision for income taxes	(30)	(4)	(40)	(13)
Net loss	$ (10,792)	$ (6,398)	$ (29,376)	$ (21,914)
Net loss per share, basic and diluted (USD per share)	$ (0.08)	$ (0.59)	$ (0.34)	$ (2.06)
Weighted-average common shares outstanding basic and diluted (shares)	132,942	10,898	86,632	10,662
Product revenue
Revenue:
Total revenue	$ 1,580	$ 3,162	$ 3,503	$ 6,870
Cost of revenue:
Total cost of revenue	1,136	2,238	2,426	4,883
Service and other revenue
Revenue:
Total revenue	616	151	1,010	470
Cost of revenue:
Total cost of revenue	$ 324	$ 137	$ 493	$ 194