Fair Value Measurements - Schedule of Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Liabilities
Convertible promissory notes (see Note 12)		$ 27,128
Legacy Gelesis preferred stock warrants (See Note 13)		15,821
One S.r.l call option (see Note 11)	$ 3,062	2,416
Total liabilities measured at fair value	10,382	45,365
Level 3
Liabilities
Convertible promissory notes (see Note 12)		27,128
Legacy Gelesis preferred stock warrants (See Note 13)		15,821
One S.r.l call option (see Note 11)	3,062	2,416
Total liabilities measured at fair value	10,382	$ 45,365
Earnout Liability
Liabilities
Earnout liability (See Note 14)	6,190
Earnout Liability | Level 3
Liabilities
Earnout liability (See Note 14)	6,190
Private Placement Warrant Liability
Liabilities
Warrant liability	1,130
Private Placement Warrant Liability | Level 3
Liabilities
Warrant liability	$ 1,130