Convertible Preferred Stock - Additional Information (Details) - USD ($)		12 Months Ended
	Aug. 03, 2020	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Preferred stock, shares outstanding		0	0
Proceeds from issuance of preferred stock	$ 292,000,000	$ 295,449,000
Percentage of non-cumulative dividends		8.00%
Preferred stock, purchase price			$ 121,253,000
ElevateBio, LLC
Class Of Stock [Line Items]
Preferred stock, purchase price		$ 20,000,000
Minimum
Class Of Stock [Line Items]
Proceeds from issuance of preferred stock		$ 100,000,000
Series A Preferred Stock
Class Of Stock [Line Items]
Shares issued, price per share		$ 1.50
Series B Preferred Stock
Class Of Stock [Line Items]
Shares issued, price per share		$ 8.15
IPO
Class Of Stock [Line Items]
Conversion of convertible preferred stock into common stock upon initial public offering, Shares	39,859,139