Fair Value Measurements - Fair value of Liabilities Measured on a Recurring Basis (Details) - Contingent consideration - Recurring - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		$ 123
Level 1
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		0
Level 2
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		(95)
Level 3
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		218
Stock appreciation rights
Financial instruments measured at fair value on a recurring basis
Fair value of the liability	$ 282	218
Stock appreciation rights | Level 1
Financial instruments measured at fair value on a recurring basis
Fair value of the liability	0	0
Stock appreciation rights | Level 2
Financial instruments measured at fair value on a recurring basis
Fair value of the liability	0	0
Stock appreciation rights | Level 3
Financial instruments measured at fair value on a recurring basis
Fair value of the liability	$ 282	218
AgroFresh Inc. | Interest rate contract
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		(95)
AgroFresh Inc. | Interest rate contract | Level 1
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		0
AgroFresh Inc. | Interest rate contract | Level 2
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		(95)
AgroFresh Inc. | Interest rate contract | Level 3
Financial instruments measured at fair value on a recurring basis
Fair value of the liability		$ 0