Grant Revenue - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2020
Grant Revenue [Line Items]
Grant revenue	$ 257	$ 325
Deferred revenue	3,941		$ 963
Bill and Melinda Gates Foundation [Member] | GREENLIGHT BIOSCIENCES HOLDINGS, PBC [Member]
Grant Revenue [Line Items]
Grant receivable					$ 3,300
Aggregate grant received			$ 900	$ 2,400
Research and developments costs associated with grant	300	300
Grant revenue	300	300
Deferred revenue	$ 700	$ 1,300