CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Series A-1 Redeemable Convertible Preferred Stock	Series A-2 Redeemable Convertible Preferred Stock	Series B Redeemable Convertible Preferred Stock
Beginning Balance at Dec. 31, 2019	$ (17,429)		$ 458	$ (17,887)
Beginning Balance, Shares at Dec. 31, 2019		119,936
Beginning Balance at Dec. 31, 2019					$ 2	$ 25,067
Beginning Balance, Shares at Dec. 31, 2019					20,000,000	62,819,866
Issuance of redeemable convertible preferred stock						$ 17,719
Issuance of redeemable convertible preferred stock, Shares						44,375,000
Stock-based compensation expense	112		112
Net loss	(7,849)			(7,849)
Ending Balance at Mar. 31, 2020	(25,123)		613	(25,736)
Ending Balance, Shares at Mar. 31, 2020		151,320
Ending Balance at Mar. 31, 2020					$ 2	$ 42,786
Ending Balance, Shares at Mar. 31, 2020					20,000,000	107,194,866
Issuance of common stock upon exercise of stock options	43		43	0
Issuance of common stock upon exercise of stock options, Shares		31,384
Beginning Balance at Dec. 31, 2019	(17,429)		458	(17,887)
Beginning Balance, Shares at Dec. 31, 2019		119,936
Beginning Balance at Dec. 31, 2019					$ 2	$ 25,067
Beginning Balance, Shares at Dec. 31, 2019					20,000,000	62,819,866
Net loss	(15,889)
Ending Balance at Jun. 30, 2020	(32,993)		783	(33,776)
Ending Balance, Shares at Jun. 30, 2020		165,310
Ending Balance at Jun. 30, 2020					$ 2	$ 42,786	$ 64,548
Ending Balance, Shares at Jun. 30, 2020					20,000,000	107,194,866	124,519,220
Beginning Balance at Mar. 31, 2020	(25,123)		613	(25,736)
Beginning Balance, Shares at Mar. 31, 2020		151,320
Beginning Balance at Mar. 31, 2020					$ 2	$ 42,786
Beginning Balance, Shares at Mar. 31, 2020					20,000,000	107,194,866
Issuance of redeemable convertible preferred stock							$ 64,548
Issuance of redeemable convertible preferred stock, Shares							124,519,220
Stock-based compensation expense	153		153
Net loss	(8,040)			(8,040)
Ending Balance at Jun. 30, 2020	(32,993)		783	(33,776)
Ending Balance, Shares at Jun. 30, 2020		165,310
Ending Balance at Jun. 30, 2020					$ 2	$ 42,786	$ 64,548
Ending Balance, Shares at Jun. 30, 2020					20,000,000	107,194,866	124,519,220
Issuance of common stock upon exercise of stock options	17		17
Issuance of common stock upon exercise of stock options, Shares		13,990
Beginning Balance at Dec. 31, 2020	$ (59,065)	$ 1	2,158	(61,224)
Beginning Balance, Shares at Dec. 31, 2020	505,074	505,074
Beginning Balance at Dec. 31, 2020					$ 2	$ 42,786	$ 64,548
Beginning Balance, Shares at Dec. 31, 2020					20,000,000	107,194,866	124,519,220
Issuance of redeemable convertible preferred stock							$ 45,375
Issuance of redeemable convertible preferred stock, Shares							87,259,605
Conversion of redeemable convertible preferred stock into common stock upon closing of initial public offering					$ (2)	$ (42,786)	$ (109,923)
Conversion of redeemable convertible preferred stock into common stock upon closing of initial public offering, Shares					(20,000,000)	(107,194,866)	(211,778,825)
Conversion of redeemable convertible preferred stock into common stock upon closing of initial public offering	$ 152,711	$ 2	152,709
Conversion of redeemable convertible preferred stock into common stock upon closing of initial public offering, Shares		24,924,501
Issuance of common shares upon closing of initial public offering, net of offering costs and underwriter fees of $17,132	186,308	$ 1	186,307
Issuance of common shares upon closing of initial public offering, net of offering costs and underwriter fees, Shares		11,302,219
Issuance of common stock upon vesting and exercise of stock options	65		65
Issuance of common stock upon vesting and exercise of stock options, Shares		38,216
Stock-based compensation expense	891		891
Net loss	(13,723)			(13,723)
Ending Balance at Mar. 31, 2021	267,187	$ 4	342,130	(74,947)
Ending Balance, Shares at Mar. 31, 2021		36,770,010
Beginning Balance at Dec. 31, 2020	$ (59,065)	$ 1	2,158	(61,224)
Beginning Balance, Shares at Dec. 31, 2020	505,074	505,074
Beginning Balance at Dec. 31, 2020					$ 2	$ 42,786	$ 64,548
Beginning Balance, Shares at Dec. 31, 2020					20,000,000	107,194,866	124,519,220
Net loss	$ (32,093)
Ending Balance at Jun. 30, 2021	$ 250,108	$ 4	343,421	(93,317)
Ending Balance, Shares at Jun. 30, 2021	36,885,372	36,885,372
Ending Balance, Shares at Jun. 30, 2021					0	0	0
Beginning Balance at Mar. 31, 2021	$ 267,187	$ 4	342,130	(74,947)
Beginning Balance, Shares at Mar. 31, 2021		36,770,010
Issuance of common stock upon vesting and exercise of stock options	224		224
Issuance of common stock upon vesting and exercise of stock options, Shares		115,362
Stock-based compensation expense	1,067		1,067
Net loss	(18,370)			(18,370)
Ending Balance at Jun. 30, 2021	$ 250,108	$ 4	$ 343,421	$ (93,317)
Ending Balance, Shares at Jun. 30, 2021	36,885,372	36,885,372
Ending Balance, Shares at Jun. 30, 2021					0	0	0