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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

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