Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statements of Operations
Revenues, net	$ 1,761	$ 116
Cost of product revenues	1,527	1,161
Gross profit (loss)	234	(1,045)
Operating expenses:
Research and development	1,257	2,123
Selling and marketing	10,553	9,253
General and administrative	3,997	3,801
Total operating expenses	15,807	15,177
Loss from operations	(15,573)	(16,222)
Other income (expense)
Interest income	1	16
Interest expense	(872)	(922)
Total other income (expense), net	(871)	(906)
Loss before benefit from income taxes	(16,444)	(17,128)
Benefit from income taxes	4,675
Net loss	$ (11,769)	$ (17,128)
Net loss per share (basic) (in dollars per share)	$ (3.78)	$ (8.00)
Net loss per share (diluted) (in dollars per share)	$ (3.78)	$ (8.00)
Weighted-average common shares (basic) (in shares)	3,115,211	2,190,650
Weighted-average common shares (diluted) (in shares)	3,115,211	2,190,650
Comprehensive loss:
Net loss	$ (11,769)	$ (17,128)
Other comprehensive income:
Unrealized loss on marketable securities		(3)
Comprehensive loss	$ (11,769)	$ (17,131)