Condensed Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Series A Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2019	$ (21)		$ 1	$ 2,829		$ (2,851)
Balance (in shares) at Dec. 31, 2019			8,703,234
Issuance of common stock	50			50
Issuance of common stock (in shares)			230,650
Net loss and comprehensive loss	(398)					(398)
Balance at Mar. 31, 2020	(369)		$ 1	2,879		(3,249)
Balance (in shares) at Mar. 31, 2020			8,933,884
Balance at Dec. 31, 2020	5,169		$ 1	13,343		(8,175)
Balance (in shares) at Dec. 31, 2020		7,064,925
Balance at Dec. 31, 2020		$ 55,738
Balance (in shares) at Dec. 31, 2020			11,953,107
Series A financing costs		$ (3)
Issuance of restricted stock (in shares)			51,526
Stock-based compensation	919			919
Unrealized loss on investments	(15)				$ (15)
Net loss and comprehensive loss	(5,852)					(5,852)
Balance at Mar. 31, 2021	$ 221		$ 1	$ 14,262	$ (15)	$ (14,027)
Balance (in shares) at Mar. 31, 2021		7,064,925
Balance at Mar. 31, 2021		$ 55,735
Balance (in shares) at Mar. 31, 2021			12,004,633