Statements of Convertible and Redeemable Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Accumulated Deficit) [Member]
Beginning Balance at Dec. 31, 2019	$ 12,910	$ 35,638	$ 0	$ 14,195	$ 20	$ (1,305)
Beginning Balance (in shares) at Dec. 31, 2019		9,342,092	3,599,232
Stock-based compensation	300			300
Unrealized loss on available-for-sale securities	(13)				(13)
Net income (loss)	3,570					3,570
Ending Balance at Dec. 31, 2020	$ 16,767	$ 35,638	$ 0	14,495	7	2,265
Ending Balance (in shares) at Dec. 31, 2020	3,599,232	9,342,092	3,599,232
Stock-based compensation	$ 1,551			1,551
Unrealized loss on available-for-sale securities	(7)				(7)
Accretion of convertible and redeemable preferred stock to redemption value	(300)	$ 300		(300)
Conversion of convertible and redeemable preferred stock	35,938	$ (35,938)	$ 0	35,938	0	0
Conversion of convertible and redeemable preferred stock (in shares)		(9,342,092)	17,512,685
Issuance of common stock upon initial public offering, net of issuance costs and underwriting discounts	99,057	$ 0	$ 0	99,057	0	0
Issuance of common stock upon initial public offering, net of issuance costs and underwriting discounts (in shares)		0	6,900,000
Issuance of stock under employee stock plans, net, Shares			100
Net income (loss)	(9,803)					(9,803)
Ending Balance at Dec. 31, 2021	$ 143,203		$ 0	$ 150,741	$ 0	$ (7,538)
Ending Balance (in shares) at Dec. 31, 2021	28,012,017	0	28,012,017