Nature of the Business - Additional Information (Details) $ / shares in Units, $ in Thousands			12 Months Ended		72 Months Ended
	Oct. 20, 2020 USD ($) $ / shares shares	Oct. 08, 2020	Dec. 31, 2020 USD ($) product $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) product $ / shares shares
Number of product candidates | product			3		3
Repurchase of Series C redeemable convertible preferred stock			$ 133,442	$ 60,388	$ 411,000
Common shares issued upon conversion of convertible preferred stock (in shares) | shares	25,067,977			16,571,383
Common stock, authorized (in shares) | shares			150,000,000	46,000,000	150,000,000
Preferred stock, authorized (in shares) | shares			10,000,000		10,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001		$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.0001	$ 0.0001	$ 0.0001
Net loss			$ (61,820)	$ (35,512)
Accumulated deficit			(149,554)	(81,009)	$ (149,554)
Cash and cash equivalents			$ 296,608	$ 44,815	$ 296,608
Common Stock
Stock split, conversion ratio		0.4673
Sale of stock, consideration received, gross amount	$ 218,500
Sale of stock, net of discounts, commissions and offering expenses	$ 200,300
IPO | Common Stock
Shares sold in IPO (in shares) | shares	11,500,000
Sale of stock, price (in dollars per share) | $ / shares	$ 19.00
Over-Allotment Option | Common Stock
Shares sold in IPO (in shares) | shares	1,500,000