Statement of Changes in Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019		3,482,850
Beginning balance at Dec. 31, 2019	$ (3,727)	$ 0	$ 1	$ (3,728)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation, expense	$ 4		4
Stock issuance upon vesting and exercise of stock options (in shares)	34,203	34,203
Net loss	$ (737)			(737)
Ending balance (in shares) at Sep. 30, 2020		3,517,053
Ending balance at Sep. 30, 2020	(4,460)	$ 0	5	(4,465)
Beginning balance (in shares) at Jun. 30, 2020		3,504,440
Beginning balance at Jun. 30, 2020	(4,127)	$ 0	3	(4,130)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance upon vesting and exercise of stock options (in shares)		12,613
Net loss	(335)			(335)
Ending balance (in shares) at Sep. 30, 2020		3,517,053
Ending balance at Sep. 30, 2020	(4,460)	$ 0	5	(4,465)
Beginning balance (in shares) at Dec. 31, 2020		3,527,850
Beginning balance at Dec. 31, 2020	(4,785)	$ 0	11	(4,796)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation, expense	85		85
Debt discount, share settled debt	$ 1,856		1,856
Stock issuance upon vesting and exercise of stock options (in shares)	27,461	27,461
Net loss	$ (2,343)			(2,343)
Ending balance (in shares) at Sep. 30, 2021		3,555,311
Ending balance at Sep. 30, 2021	(5,187)	$ 0	1,952	(7,139)
Beginning balance (in shares) at Jun. 30, 2021		3,547,168
Beginning balance at Jun. 30, 2021	(4,264)	$ 0	1,687	(5,951)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation, expense	53		53
Debt discount, share settled debt	212		212
Stock issuance upon vesting and exercise of stock options (in shares)		8,143
Net loss	(1,188)			(1,188)
Ending balance (in shares) at Sep. 30, 2021		3,555,311
Ending balance at Sep. 30, 2021	$ (5,187)	$ 0	$ 1,952	$ (7,139)