CONDENSED CONSOLIDATED STATEMENTS OF NONCONTROLLING INTEREST, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Previously Reported	Legacy Gelesis Redeemable Convertible Preferred Stock	Legacy Gelesis Redeemable Convertible Preferred Stock Previously Reported	Legacy Gelesis Redeemable Convertible Preferred Stock Retroactive Application of Recapitalization	Series A-3 Redeemable Convertible Preferred Stock	Noncontrolling Interest	Noncontrolling Interest Previously Reported	Common Stock	Common Stock Previously Reported	Common Stock Retroactive Application of Recapitalization	Additional Paid-in Capital	Additional Paid-in Capital Previously Reported	Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income Previously Reported	Accumulated Deficit	Accumulated Deficit Previously Reported
Balance at Dec. 31, 2020	$ (146,938)	$ (146,938)							$ 1	$ 1		$ 23,907	$ 23,907	$ 938	$ 938	$ (171,784)	$ (171,784)
Temporary Equity Balance at Dec. 31, 2020			$ 213,525	$ 213,525			$ 12,429	$ 12,429
Temporary Equity Balance, shares at Dec. 31, 2020			47,813,946	18,446,525	29,367,421
Balance, shares at Dec. 31, 2020									5,587,094	2,155,490	3,431,604
Accretion of Legacy Gelesis senior preferred stock to redemption value	(33,761)											(33,761)
Temporary Equity, Accretion of Legacy Gelesis senior preferred stock to redemption value			$ 33,761
Temporary Equity, Exercise of Legacy Gelesis preferred stock warrants						$ 2,997
Temporary Equity, Exercise of Legacy Gelesis preferred stock warrants, shares						752,709
Stock based compensation expense	1,455											1,455
Issuance of common stock upon exercise of stock options	4											4
Issuance of common stock upon exercise of stock options shares									2,634
Accretion of noncontrolling interest put option to redemption value	(94)															(94)
Temporary Equity, Accretion of noncontrolling interest put option to redemption value							94
Foreign currency translation adjustment	(411)													(411)
Temporary Equity, Foreign currency translation adjustment							(546)
Net loss	(18,586)															(18,586)
Balance at Mar. 31, 2021	(198,331)								$ 1			(8,395)		527		(190,464)
Temporary Equity Balance at Mar. 31, 2021				$ 250,283			11,977
Temporary Equity Balance, shares at Mar. 31, 2021			48,566,655
Balance, shares at Mar. 31, 2021									5,589,728
Balance at Dec. 31, 2020	(146,938)	(146,938)							$ 1	$ 1		23,907	23,907	938	938	(171,784)	(171,784)
Temporary Equity Balance at Dec. 31, 2020			$ 213,525	$ 213,525			12,429	12,429
Temporary Equity Balance, shares at Dec. 31, 2020			47,813,946	18,446,525	29,367,421
Balance, shares at Dec. 31, 2020									5,587,094	2,155,490	3,431,604
Net loss	(43,325)
Balance at Jun. 30, 2021	(303,844)								$ 1			(89,116)		570		(215,299)
Temporary Equity Balance at Jun. 30, 2021				$ 333,585			12,225
Temporary Equity Balance, shares at Jun. 30, 2021			48,566,655
Balance, shares at Jun. 30, 2021									5,615,192
Balance at Mar. 31, 2021	(198,331)								$ 1			(8,395)		527		(190,464)
Temporary Equity Balance at Mar. 31, 2021				250,283			11,977
Temporary Equity Balance, shares at Mar. 31, 2021			48,566,655
Balance, shares at Mar. 31, 2021									5,589,728
Accretion of Legacy Gelesis senior preferred stock to redemption value	(82,365)											(82,365)
Temporary Equity, Accretion of Legacy Gelesis senior preferred stock to redemption value			$ 82,365
Temporary Equity, Exercise of Legacy Gelesis preferred stock warrants			$ 937
Stock based compensation expense	1,639											1,639
Issuance of common stock upon exercise of stock options	5											5
Issuance of common stock upon exercise of stock options shares									25,464
Accretion of noncontrolling interest put option to redemption value	(96)															(96)
Temporary Equity, Accretion of noncontrolling interest put option to redemption value							96
Foreign currency translation adjustment	43													43
Temporary Equity, Foreign currency translation adjustment							152
Net loss	(24,739)															(24,739)
Balance at Jun. 30, 2021	(303,844)								$ 1			(89,116)		570		(215,299)
Temporary Equity Balance at Jun. 30, 2021				333,585			12,225
Temporary Equity Balance, shares at Jun. 30, 2021			48,566,655
Balance, shares at Jun. 30, 2021									5,615,192
Balance at Dec. 31, 2021	(329,836)	(329,836)							$ 1	$ 1		(64,549)	(64,549)	219	219	(265,507)	(265,507)
Temporary Equity Balance at Dec. 31, 2021			$ 311,594	$ 311,594			11,855	11,855
Temporary Equity Balance, shares at Dec. 31, 2021			48,566,655	18,736,936	29,829,719
Balance, shares at Dec. 31, 2021									6,248,192	2,410,552	3,837,640
Accretion of legacy gelesis senior preferred stock to redemption value prior to business combination	(37,934)											(37,934)
Temporary Equity, Accretion of legacy gelesis senior preferred stock to redemption value prior to business combination			$ 37,934
Conversion of legacy gelesis convertible preferred stock into common stock upon business combination	349,528											349,528
Conversion of legacy gelesis convertible preferred stock into common stock upon business combination, shares									48,566,655
Temporary Equity, Conversion of legacy gelesis convertible preferred stock into common stock upon business combination			$ (349,528)
Temporary Equity, Conversion of legacy gelesis convertible preferred stock into common stock upon business combination, shares			(48,566,655)
Proceeds from business combination, net of issuance costs and assumed liabilities	70,478								$ 6			70,472
Proceeds from business combination, net of issuance costs and assumed liabilities, shares									17,399,440
Conversion of legacy gelesis preferred stock warrants into common stock warrants upon business combination	16,747											16,747
Recognition of earnout liability upon Business Combination	(58,871)											(58,871)
Assumed private placement warrant liability upon business combination	(8,140)											(8,140)
Exercise of warrants	4											4
Exercise of warrants, shares									176,126
Stock based compensation expense	13,989											13,989
Accretion of noncontrolling interest put option to redemption value	(88)															(88)
Temporary Equity, Accretion of noncontrolling interest put option to redemption value							88
Foreign currency translation adjustment	(137)													(137)
Temporary Equity, Foreign currency translation adjustment							(239)
Net loss	(5,703)															(5,703)
Balance at Mar. 31, 2022	10,037								$ 7			281,246		82		(271,298)
Temporary Equity Balance at Mar. 31, 2022							11,704
Balance, shares at Mar. 31, 2022									72,390,413
Balance at Dec. 31, 2021	$ (329,836)	$ (329,836)							$ 1	$ 1		(64,549)	$ (64,549)	219	$ 219	(265,507)	$ (265,507)
Temporary Equity Balance at Dec. 31, 2021			$ 311,594	$ 311,594			11,855	$ 11,855
Temporary Equity Balance, shares at Dec. 31, 2021			48,566,655	18,736,936	29,829,719
Balance, shares at Dec. 31, 2021									6,248,192	2,410,552	3,837,640
Issuance of common stock upon exercise of stock options shares	162,064
Net loss	$ (18,216)
Balance at Jun. 30, 2022	5,098								$ 7			289,332		(344)		(283,896)
Temporary Equity Balance at Jun. 30, 2022							11,087
Temporary Equity Balance, shares at Jun. 30, 2022			0
Balance, shares at Jun. 30, 2022									72,552,477
Balance at Mar. 31, 2022	10,037								$ 7			281,246		82		(271,298)
Temporary Equity Balance at Mar. 31, 2022							11,704
Balance, shares at Mar. 31, 2022									72,390,413
Stock based compensation expense	7,976											7,976
Issuance of common stock upon exercise of stock options	110								$ 0			110
Issuance of common stock upon exercise of stock options shares									162,064
Accretion of noncontrolling interest put option to redemption value	(85)															(85)
Temporary Equity, Accretion of noncontrolling interest put option to redemption value							85
Foreign currency translation adjustment	(426)													(426)
Temporary Equity, Foreign currency translation adjustment							(702)
Net loss	(12,513)															(12,513)
Balance at Jun. 30, 2022	$ 5,098								$ 7			$ 289,332		$ (344)		$ (283,896)
Temporary Equity Balance at Jun. 30, 2022							$ 11,087
Temporary Equity Balance, shares at Jun. 30, 2022			0
Balance, shares at Jun. 30, 2022									72,552,477