STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Total revenues	$ 1,019	$ 600
Cost of sales	555	356
Gross profit	464	244
Operating expenses:
Research and development	1,859	1,954
Selling, general and administrative	8,279	7,224
Total operating expenses	10,138	9,178
Loss from operations	(9,674)	(8,934)
Other income (expense):
Interest income	7	4
Interest expense	(2)	(11)
Payroll Protection Program loan forgiveness	0	651
Miscellaneous income (expense)	(26)	22
Other income (expense), net	(21)	666
Net loss	(9,695)	(8,268)
Comprehensive loss	$ (9,695)	$ (8,268)
Weighted average shares outstanding - basic (in shares)	625,401	559,591
Weighted average shares outstanding - diluted (in shares)	625,401	559,591
Loss per share - basic (in dollars per share)	$ (15.50)	$ (14.77)
Loss per share - diluted (in dollars per share)	$ (15.50)	$ (14.77)
Product sales, net
Revenues:
Total revenues	$ 1,019	$ 576
Grant revenue
Revenues:
Total revenues	$ 0	$ 24