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)			$ 111
Vesting of Series A Preferred Stock in connection with collaboration arrangement (Note 5), Shares			55,394
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
Vesting restricted stock, Shares							46,297
Stock-based compensation expense	371							371
Unrealized gain on marketable securities	214									214
Net Loss	(10,932)								(10,932)
Temporary Equity, Ending Balance, Shares at Mar. 31, 2020		3,000,000	12,786,718	16,009,845	3,059,695	15,527,943
Temporary Equity, Ending Balance at Mar. 31, 2020		$ 5,900	$ 25,398	$ 64,718	$ 14,025	$ 101,180
Ending Balance at Mar. 31, 2020	(93,803)							82	(94,105)	220
Ending Balance, Shares at Mar. 31, 2020							1,975,813
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
Exercise of stock options	1,147							1,147
Exercise of stock options, Shares							378,762
Vesting restricted stock, Shares							18,428
Stock-based compensation expense	3,172							3,172
Unrealized gain on marketable securities	115									115
Net Loss	(13,075)								(13,075)
Ending Balance at Mar. 31, 2021	$ 275,247						$ 4	$ 417,096	$ (141,840)	$ (13)
Ending Balance, Shares at Mar. 31, 2021							44,879,376