CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 7,755	$ 5,947	$ 21,726	$ 12,528
Cost of product revenue	5,879	4,884	16,212	12,988
Gross profit (loss)	1,876	1,063	5,514	(460)
Operating expenses:
Research and development	8,390	8,876	19,576	19,028
Sales and marketing	6,737	2,394	14,777	6,305
General and administrative	14,073	4,512	36,177	11,856
Total operating expenses	29,200	15,782	70,530	37,189
Loss from operations	(27,324)	(14,719)	(65,016)	(37,649)
Other (expense) income:
Interest income	165	1	305	24
Interest expense	0	(521)	(504)	(2,196)
Other income (expense), net	14,490	(4,376)	(422)	(9,799)
Total other expense, net	14,655	(4,896)	(621)	(11,971)
Loss before income taxes	(12,669)	(19,615)	(65,637)	(49,620)
Provision for income tax expense	0	0	0	0
Net loss	(12,669)	(19,615)	(65,637)	(49,620)
Comprehensive loss	$ (12,669)	$ (19,615)	$ (65,637)	$ (49,620)
Net loss per common share, basic (in dollars per share)	$ (0.08)	$ (0.97)	$ (0.53)	$ (3.15)
Net loss per common share, diluted (in dollars per share)	$ (0.08)	$ (0.97)	$ (0.53)	$ (3.15)
Weighted-average shares used to compute basic net loss per share (in shares)	156,647,259	20,303,631	123,175,390	15,753,057
Weighted-average shares used to compute diluted net loss per share (in shares)	156,647,259	20,303,631	123,175,390	15,753,057
Product
Income Statement [Abstract]
Revenue	$ 7,755	$ 5,934	$ 21,726	$ 10,524
Cost of product revenue	5,879	4,884	16,212	12,962
Service
Income Statement [Abstract]
Revenue	0	13	0	2,004
Cost of product revenue	$ 0	$ 0	$ 0	$ 26