Unaudited Condensed Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Convertible Preferred Stock [Member]	Series A Convertible Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Series Seed 2 Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Temporary equity, Beginning balance at Dec. 31, 2019		$ 3,996
Temporary equity, Beginning balance (in shares) at Dec. 31, 2019		2,689,997
Beginning balance at Dec. 31, 2019	$ (7,944)					$ 1	$ 10	$ 0	$ (7,955)
Beginning balance (in shares) at Dec. 31, 2019						774,008
Issuance of convertible preferred stock, net of issuance costs					$ 4,500
Issuance of convertible preferred stock, net of issuance costs (in shares)					1,056,337
Conversion of convertible preferred stock to common stock in connection with initial public offering, converted	0
Conversion of convertible promissory notes into convertible preferred stock					$ 8,674
Conversion of convertible promissory notes into convertible preferred stock (in shares)					2,036,158
Temporary equity,, Exercise of common stock options		$ (39)
Exercise of common stock options	4						4
Exercise of common stock options (in shares)						36,508
Vesting of restricted shares (in shares)						159,050
Stock-based compensation	32						32
Unrealized gain (loss) on investment securities	0
Net loss	(5,129)								(5,129)
Temporary equity, Ending balance at Sep. 30, 2020		$ 17,131
Temporary equity, Ending balance (in shares) at Sep. 30, 2020		5,782,492
Ending balance at Sep. 30, 2020	(13,037)					$ 1	46	0	(13,084)
Ending balance (in shares) at Sep. 30, 2020						969,566
Temporary equity, Beginning balance at Jun. 30, 2020		$ 17,131
Temporary equity, Beginning balance (in shares) at Jun. 30, 2020		5,782,492
Beginning balance at Jun. 30, 2020	(11,809)					$ 1	18	0	(11,828)
Beginning balance (in shares) at Jun. 30, 2020						916,550
Vesting of restricted shares (in shares)						53,016
Stock-based compensation	28						28
Net loss	(1,256)								(1,256)
Temporary equity, Ending balance at Sep. 30, 2020		$ 17,131
Temporary equity, Ending balance (in shares) at Sep. 30, 2020		5,782,492
Ending balance at Sep. 30, 2020	(13,037)					$ 1	46	0	(13,084)
Ending balance (in shares) at Sep. 30, 2020						969,566
Temporary equity, Beginning balance at Dec. 31, 2020	$ 21,624	$ 21,624
Temporary equity, Beginning balance (in shares) at Dec. 31, 2020	6,838,829	6,838,829
Beginning balance at Dec. 31, 2020	$ (14,638)					$ 1	100	0	(14,739)
Beginning balance (in shares) at Dec. 31, 2020						1,046,599
Issuance of convertible preferred stock, net of issuance costs			$ 55,722	$ 124,825
Issuance of convertible preferred stock, net of issuance costs (in shares)			5,894,740	8,038,073
Conversion of convertible preferred stock to common stock in connection with initial public offering, converted	(202,171)	$ (202,171)
Conversion of convertible preferred stock to common stock in connection with initial public offering, converted (in shares)		(20,771,642)
Conversion of convertible preferred stock to common stock in connection with initial public offering, issued	202,171					$ 27	202,144
Conversion of convertible preferred stock to common stock in connection with initial public offering, issued (in shares)						26,608,460
Initial public offering, net of issuance costs	204,137					$ 13	204,124
Initial public offering, net of issuance costs (in shares)						13,110,000
Exercise of common stock options	$ 20						20
Exercise of common stock options (in shares)	635,316					113,418
Vesting of restricted shares	$ 326						326
Vesting of restricted shares (in shares)						293,486
Stock-based compensation	3,966						3,966
Unrealized gain (loss) on investment securities	24							24
Net loss	(19,256)								(19,256)
Temporary equity, Ending balance at Sep. 30, 2021	$ 0	$ 0
Temporary equity, Ending balance (in shares) at Sep. 30, 2021	0	0
Ending balance at Sep. 30, 2021	$ 376,750					$ 41	410,680	24	(33,995)
Ending balance (in shares) at Sep. 30, 2021						41,171,963
Beginning balance at Jun. 30, 2021	384,795					$ 41	407,966	17	(23,229)
Beginning balance (in shares) at Jun. 30, 2021						41,094,559
Vesting of restricted shares	148						148
Vesting of restricted shares (in shares)						77,404
Stock-based compensation	2,566						2,566
Unrealized gain (loss) on investment securities	7							7
Net loss	(10,766)								(10,766)
Temporary equity, Ending balance at Sep. 30, 2021	$ 0	$ 0
Temporary equity, Ending balance (in shares) at Sep. 30, 2021	0	0
Ending balance at Sep. 30, 2021	$ 376,750					$ 41	$ 410,680	$ 24	$ (33,995)
Ending balance (in shares) at Sep. 30, 2021						41,171,963