CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Total	Series Seed Convertible Preferred Stock	Series A Convertible Preferred Stock	Series B Convertible Preferred Stock	Series B-1 Convertible Preferred Stock	Series C Convertible Preferred Stock	Common Stock	Additional Paid In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2019		3,000,000	14,720,126	14,827,580	3,059,695
Temporary Equity, Beginning Balance at Dec. 31, 2019		$ 5,900	$ 29,237	$ 59,918	$ 14,025
Beginning Balance at Dec. 31, 2019	$ (74,406)							$ 2,044	$ (76,456)	$ 6
Beginning Balance, Shares at Dec. 31, 2019							1,929,516
Vesting of Series A Preferred Stock in connection with collaboration arrangement (Note 5)			$ 222
Vesting of Series A Preferred Stock in connection with collaboration arrangement (Note 5), Shares			110,788
Issuance of Preferred Stock, net of issuance costs				$ 4,800		$ 88,180
Issuance of Preferred Stock, net of issuance costs, Shares				1,182,265		13,539,141
Exchange of Series A Convertible Preferred Stock for Series C Preferred Convertible Preferred Stock	(9,050)							(2,333)	(6,717)
Temporary Equity, Exchange of Series A Convertible Preferred Stock for Series C Preferred Convertible Preferred Stock, Shares			(1,988,802)			1,988,802
Temporary Equity, Exchange of Series A Convertible Preferred Stock for Series C Preferred Convertible Preferred Stock			$ (3,950)			$ 13,000
Exercise of stock options	28							28
Exercise of stock options, Shares							16,106
Vesting restricted stock, Shares							90,334
Stock-based compensation expense	1,035							1,035
Unrealized gain on marketable securities	25									25
Net Loss	(24,921)								(24,921)
Ending Balance at Jun. 30, 2020	(107,289)							774	(108,094)	31
Temporary Equity, Ending Balance, Shares at Jun. 30, 2020		3,000,000	12,842,112	16,009,845	3,059,695	15,527,943
Temporary Equity, Ending Balance at Jun. 30, 2020		$ 5,900	$ 25,509	$ 64,718	$ 14,025	$ 101,180
Ending Balance, Shares at Jun. 30, 2020							2,035,956
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2019		3,000,000	14,720,126	14,827,580	3,059,695
Temporary Equity, Beginning Balance at Dec. 31, 2019		$ 5,900	$ 29,237	$ 59,918	$ 14,025
Beginning Balance at Dec. 31, 2019	(74,406)							2,044	(76,456)	6
Beginning Balance, Shares at Dec. 31, 2019							1,929,516
Ending Balance at Dec. 31, 2020	283,888						$ 4	412,777	(128,765)	(128)
Ending Balance, Shares at Dec. 31, 2020							44,482,186
Temporary Equity, Beginning Balance, Shares at Mar. 31, 2020		3,000,000	12,786,718	16,009,845	3,059,695	15,527,943
Temporary Equity, Beginning Balance at Mar. 31, 2020		$ 5,900	$ 25,398	$ 64,718	$ 14,025	$ 101,180
Beginning Balance at Mar. 31, 2020	(93,803)							82	(94,105)	220
Beginning Balance, Shares at Mar. 31, 2020							1,975,813
Vesting of Series A Preferred Stock in connection with collaboration arrangement (Note 5)			$ 111
Vesting of Series A Preferred Stock in connection with collaboration arrangement (Note 5), Shares			55,394
Exercise of stock options	28							28
Exercise of stock options, Shares							16,106
Vesting restricted stock, Shares							44,037
Stock-based compensation expense	664							664
Unrealized gain on marketable securities	(189)									(189)
Net Loss	(13,989)								(13,989)
Ending Balance at Jun. 30, 2020	(107,289)							774	(108,094)	31
Temporary Equity, Ending Balance, Shares at Jun. 30, 2020		3,000,000	12,842,112	16,009,845	3,059,695	15,527,943
Temporary Equity, Ending Balance at Jun. 30, 2020		$ 5,900	$ 25,509	$ 64,718	$ 14,025	$ 101,180
Ending Balance, Shares at Jun. 30, 2020							2,035,956
Beginning Balance at Dec. 31, 2020	283,888						$ 4	412,777	(128,765)	(128)
Beginning Balance, Shares at Dec. 31, 2020							44,482,186
Exercise of stock options	2,618						$ 1	2,617
Exercise of stock options, Shares							801,233
Vesting restricted stock, Shares							36,582
Issuance of shares under employee stock purchase plan	307							307
Issuance of shares under employee stock purchase plan, Shares							7,680
Stock-based compensation expense	8,898							8,898
Unrealized gain on marketable securities	128									128
Net Loss	(37,735)								(37,735)
Ending Balance at Jun. 30, 2021	258,104						$ 5	424,599	(166,500)
Ending Balance, Shares at Jun. 30, 2021							45,327,681
Beginning Balance at Mar. 31, 2021	275,247						$ 4	417,096	(141,840)	(13)
Beginning Balance, Shares at Mar. 31, 2021							44,879,376
Exercise of stock options	1,471						$ 1	1,470
Exercise of stock options, Shares							422,471
Vesting restricted stock, Shares							18,154
Issuance of shares under employee stock purchase plan	307							307
Issuance of shares under employee stock purchase plan, Shares							7,680
Stock-based compensation expense	5,726							5,726
Unrealized gain on marketable securities	13									$ 13
Net Loss	(24,660)								(24,660)
Ending Balance at Jun. 30, 2021	$ 258,104						$ 5	$ 424,599	$ (166,500)
Ending Balance, Shares at Jun. 30, 2021							45,327,681