Condensed Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	IPO	Series A Convertible Preferred Stock	Common Stock	Common Stock IPO	Additional Paid-In Capital	Additional Paid-In Capital IPO	Accumulated Other Comprehensive Gain (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, net of offering costs	50					50
Issuance of common stock, net of offering costs (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, 2019	(21)			$ 1		2,829			(2,851)
Balance (in shares) at Dec. 31, 2019				8,703,234
Net loss and comprehensive loss	(1,826)
Balance at Sep. 30, 2020	7,695			$ 1		12,371			(4,677)
Balance (in shares) at Sep. 30, 2020				11,724,100
Balance at Mar. 31, 2020	(369)			$ 1		2,879			(3,249)
Balance (in shares) at Mar. 31, 2020				8,933,884
Issuance of common stock, net of offering costs	9,492					9,492
Issuance of common stock, net of offering costs (in shares)				2,790,216
Net loss and comprehensive loss	(293)								(293)
Balance at Jun. 30, 2020	8,830			$ 1		12,371			(3,542)
Balance (in shares) at Jun. 30, 2020				11,724,100
Net loss and comprehensive loss	(1,135)								(1,135)
Balance at Sep. 30, 2020	7,695			$ 1		12,371			(4,677)
Balance (in shares) at Sep. 30, 2020				11,724,100
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 expense	919					919
Unrealized gain (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
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
Exercise of stock options, (in shares)	43,850
Unrealized gain (loss) on investments	$ 2
Net loss and comprehensive loss	(26,857)
Balance at Sep. 30, 2021	$ 191,331			$ 2		226,359		2	(35,032)
Balance (in shares) at Sep. 30, 2021	0		0
Balance (in shares) at Sep. 30, 2021				29,041,708
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
Issuance of common stock, net of offering costs		$ 152,754			$ 1		$ 152,753
Issuance of common stock, net of offering costs (in shares)					9,823,532
Issuance of restricted stock (in shares)				53,240
Stock-based compensation expense	1,463					1,463
Exercise of stock options	225					225
Exercise of stock options, (in shares)				43,850
Conversion of preferred stock to common stock	55,735					55,735
Conversion of preferred stock to common stock (in shares)			(7,064,925)
Conversion of convertible preferred stock into common stock			$ (55,735)
Conversion of preferred stock to common stock (in shares)				7,064,925
Unrealized gain (loss) on investments	17							17
Net loss and comprehensive loss	(8,399)								(8,399)
Balance at Jun. 30, 2021	202,016			$ 2		224,438		2	(22,426)
Balance (in shares) at Jun. 30, 2021				28,990,180
Issuance of restricted stock (in shares)				51,528
Stock-based compensation expense	1,921					1,921
Net loss and comprehensive loss	(12,606)								(12,606)
Balance at Sep. 30, 2021	$ 191,331			$ 2		$ 226,359		$ 2	$ (35,032)
Balance (in shares) at Sep. 30, 2021	0		0
Balance (in shares) at Sep. 30, 2021				29,041,708