CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Total Groupon, Inc. Stockholders' Equity	Total Groupon, Inc. Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2018					38,046,972			(9,592,756)
Beginning balance at Dec. 31, 2018	$ 382,611		$ 381,248		$ 4	$ 2,234,632		$ (877,491)	$ (1,010,499)		$ 34,602	$ 1,363
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Comprehensive income (loss)	$ (7,216)		(17,898)						(22,377)		4,479	10,682
Exercise of stock options (in shares)					3,743
Exercise of stock options	40		40			40
Vesting of restricted stock units and performance share units (in shares)					720,951
Shares issued under employee stock purchase plan (in shares)					74,299
Shares issued under employee stock purchase plan	4,083		4,083			4,083
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)					(261,111)
Tax withholdings related to net share settlements of stock-based compensation awards	(17,413)		(17,413)			(17,413)
Stock-based compensation on equity-classified awards	89,051		89,051			89,051
Repurchases of common stock (in shares)								(701,361)
Repurchases of common stock	(45,175)		(45,175)					$ (45,175)
Distributions to noncontrolling interest holders	(10,935)											(10,935)
Ending balance (in shares) at Dec. 31, 2019					38,584,854			(10,294,117)
Ending balance at Dec. 31, 2019	$ 395,046	$ (79)	393,936	$ (79)	$ 4	2,310,393		$ (922,666)	(1,032,876)	$ (79)	39,081	1,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06
Comprehensive income (loss)	$ (322,152)		(323,903)						(287,931)		(35,972)	1,751
Vesting of restricted stock units and performance share units (in shares)					784,385
Shares issued under employee stock purchase plan (in shares)					69,371
Shares issued under employee stock purchase plan	1,791		1,791			1,791
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)					(295,714)
Tax withholdings related to net share settlements of stock-based compensation awards	(9,754)		(9,754)			(9,754)
Stock-based compensation on equity-classified awards	45,684		45,684			45,684
Distributions to noncontrolling interest holders	(2,862)											(2,862)
Ending balance (in shares) at Dec. 31, 2020					39,142,896			(10,294,117)
Ending balance at Dec. 31, 2020	107,674	$ (18,969)	107,675	$ (18,969)	$ 4	2,348,114	$ (64,319)	$ (922,666)	(1,320,886)	$ 45,350	3,109	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	112,426		110,746						118,668		(7,922)	1,680
Vesting of restricted stock units and performance share units (in shares)					1,319,695
Shares issued under employee stock purchase plan (in shares)					49,399
Shares issued under employee stock purchase plan	1,128		1,128			1,128
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)					(504,735)
Tax withholdings related to net share settlements of stock-based compensation awards	(19,834)		(19,834)			(19,834)
Purchase of capped call transactions, net of tax	(20,502)		(20,502)			(20,502)
Settlement of convertible note hedges, net of tax	14,511		14,511			14,511
Settlement of warrants	(1,752)		(1,752)			(1,752)
Stock-based compensation on equity-classified awards	36,869		36,869			36,869
Distributions to noncontrolling interest holders	(1,255)											(1,255)
Ending balance (in shares) at Dec. 31, 2021					40,007,255			(10,294,117)
Ending balance at Dec. 31, 2021	$ 210,296		$ 209,872		$ 4	$ 2,294,215		$ (922,666)	$ (1,156,868)		$ (4,813)	$ 424