Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accrued Liabilities, Current [Line Items]
Total accrued expenses	$ 9,398	$ 14,624
GREENLIGHT BIOSCIENCES HOLDINGS, PBC [Member]
Accrued Liabilities, Current [Line Items]
Accrued employee compensation and benefits	4,620	8,492
Accrued research and development	2,169	4,059
Accrued professional fees	1,334	1,888
Accrued other	1,275	185
Total accrued expenses	$ 9,398	$ 14,624