Nature of the Business - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Nature Of Business [Line Items]
Accumulated deficit	$ 1,240,503	$ 1,037,494
Net income from up-front		$ 606,100
Up-front payments receive	1,000,000
Redeemable Convertible Preferred Stock [Member] | Convertible Notes [Member] | Initial Public Offering [Member]
Nature Of Business [Line Items]
Net proceeds from sale of equity and notes	$ 2,800,000