Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statements of Operations
Revenues, net	$ 116
Cost of product revenues	1,161
Gross profit	(1,045)
Operating expenses:
Research and development	2,113	$ 3,164
Selling and marketing	9,163	1,742
General and administrative	3,901	2,711
Total operating expenses	15,177	7,617
Loss from operations	(16,222)	(7,617)
Other income (expense)
Interest income	16	132
Interest expense	(922)	(398)
Total other income (expense), net	(906)	(266)
Loss before benefit from income taxes	(17,128)	(7,883)
Net loss	$ (17,128)	$ (7,883)
Net loss per share (basic and diluted) (in dollars per share)	$ (0.20)	$ (0.10)
Weighted-average common shares (basic and diluted) (in shares)	87,625,990	76,652,190
Comprehensive loss:
Net loss	$ (17,128)	$ (7,883)
Other comprehensive income:
Unrealized loss on marketable securities	(3)
Comprehensive loss	$ (17,131)	$ (7,883)