CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Product revenue	$ 6,611	$ 2,300
Revenue from Contract with Customer, Product and Service [Extensible List]	Product	Product
Cost of product revenue	$ 4,868	$ 4,216
Cost, Product and Service [Extensible List]	Product	Product
Gross profit (loss)	$ 1,743	$ (1,916)
Operating expenses:
Research and development	4,712	4,474
Sales and marketing	3,426	2,226
General and administrative	9,907	3,666
Total operating expenses	18,045	10,366
Loss from operations	(16,302)	(12,282)
Other (expense) income:
Interest income	1	22
Interest expense	(504)	(1,277)
Other income (expense), net	(4,152)	(5,156)
Total other expense, net	(4,655)	(6,411)
Loss before income taxes	(20,957)	(18,693)
Provision for income tax expense	0	0
Net loss	(20,957)	(18,693)
Comprehensive loss	$ (20,957)	$ (18,693)
Net loss per common share, basic (in dollars per share)	$ (0.38)	$ (2.41)
Net loss per common share, diluted (in dollars per share)	$ (0.38)	$ (2.41)
Weighted-average shares used to compute basic net loss per share (in shares)	55,688,281	7,767,169
Weighted-average shares used to compute diluted net loss per share (in shares)	55,688,281	7,767,169