Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity - Mezzanine Equity - USD ($) $ in Thousands	Series X redeemable convertible preferred stock	Total
Mezzanine equity, beginning balance at Dec. 31, 2020	$ 0
Mezzanine equity, beginning balance (in shares) at Dec. 31, 2020	0
Series X redeemable convertible preferred stock
Issuance of preferred stock in a private offering of public equity, net of issuance costs	$ 84,696
Issuance of preferred stock in a private offering of public equity, net of issuance costs (in shares)	35,573
Issuance of preferred stock and common stock upon acquisition of Quellis	$ 156,185
Issuance of preferred stock and common stock upon acquisition of Quellis (in shares)	50,504
Mezzanine equity, ending balance at Mar. 31, 2021	$ 240,881
Mezzanine equity, ending balance (in shares) at Mar. 31, 2021	86,077
Series X redeemable convertible preferred stock
Reclassification of preferred stock to permanent equity	$ (240,881)
Issuance of common stock upon the conversion of preferred stock		$ 1
Reclassification of preferred stock to permanent equity (in shares)	(86,077)