Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statements of Operations
Revenues, net	$ 2,126	$ 1,185	$ 3,887	$ 1,301
Cost of product revenues	2,231	1,145	3,758	2,306
Gross profit (loss)	(105)	40	129	(1,005)
Operating expenses:
Research and development	856	862	2,113	2,975
Selling and marketing	7,411	11,977	17,964	21,240
General and administrative	3,026	3,852	7,023	7,653
Total operating expenses	11,293	16,691	27,100	31,868
Loss from operations	(11,398)	(16,651)	(26,971)	(32,873)
Other income (expense)
Interest income	2	7	3	23
Interest expense	(823)	(993)	(1,695)	(1,915)
Total other income (expense), net	(821)	(986)	(1,692)	(1,892)
Loss before benefit from income taxes	(12,219)	(17,637)	(28,663)	(34,765)
Benefit from income taxes			4,675
Net loss	$ (12,219)	$ (17,637)	$ (23,988)	$ (34,765)
Net loss per share (basic) (in dollars per share)	$ (2.71)	$ (8.00)	$ (6.29)	$ (15.60)
Net loss per share (diluted) (in dollars per share)	$ (2.71)	$ (8.00)	$ (6.29)	$ (15.60)
Weighted-average common shares (basic) (in shares)	4,510,219	2,217,349	3,816,569	2,204,073
Weighted-average common shares (diluted) (in shares)	4,510,219	2,217,349	3,816,569	2,204,073
Comprehensive loss:
Net loss	$ (12,219)	$ (17,637)	$ (23,988)	$ (34,765)
Other comprehensive income:
Unrealized loss on marketable securities				(3)
Comprehensive loss	$ (12,219)	$ (17,637)	$ (23,988)	$ (34,768)