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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-in Capital | [1] | Treasury Stock | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) | Total Groupon, Inc. Stockholders' Equity | Total Groupon, Inc. Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 | [1] |  |  | 37,427,093 |  |  | (9,430,112) |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 |  | $ 251,845 | $ 88,945 | $ 4 | [1] | $ 2,174,779 | $ (867,450) | [1] | $ (1,088,204) | $ 88,945 | $ 31,844 | $ 250,973 | $ 88,945 | $ 872
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification for impact of U.S. tax rate change |  | 0 |  |  |  |  |  |  | (161) |  | 161 | 0 |  |
Comprehensive income (loss) |  | 4,585 |  |  |  |  |  |  | (11,079) |  | 2,597 | (8,482) |  | 13,067
Exercise in stock options (in shares) | [1] |  |  | 33,639 |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  | 81 |  |  |  | 81 |  |  |  |  |  | 81 |  |
Vesting of restricted stock units and performance share units (in shares) | [1] |  |  | 713,244 |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) | [1] |  |  | 81,053 |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan |  | 5,634 |  |  |  | 5,634 |  |  |  |  |  | 5,634 |  |
Shares issued to settle liability-classified awards (in shares) | [1] |  |  | 62,018 |  |  |  |  |  |  |  |  |  |
Shares issued to settle liability-classified awards |  | 6,436 |  |  |  | 6,436 |  |  |  |  |  | 6,436 |  |
Tax withholdings related to net share settlements of stock-based compensation awards (in shares) | [1] |  |  | (270,075) |  |  |  |  |  |  |  |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards |  | (22,709) |  |  |  | (22,709) |  |  |  |  |  | (22,709) |  |
Stock-based compensation on equity-classified awards |  | 70,411 |  |  |  | 70,411 |  |  |  |  |  | 70,411 |  |
Repurchases of common stock (in shares) | [1] |  |  |  |  |  | (162,644) |  |  |  |  |  |  |
Repurchases of common stock |  | (10,041) |  |  |  |  | $ (10,041) | [1] |  |  |  | (10,041) |  |
Distributions to noncontrolling interest holders |  | (12,576) |  |  |  |  |  |  |  |  |  |  |  | (12,576)
Ending balance (in shares) at Dec. 31, 2018 | [1] |  |  | 38,046,972 |  |  | (9,592,756) |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | $ 382,611 |  | $ 4 | [1] | 2,234,632 | $ (877,491) | [1] | (1,010,499) |  | 34,602 | 381,248 |  | 1,363
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | $ (7,216) |  |  |  |  |  |  | (22,377) |  | 4,479 | (17,898) |  | 10,682
Exercise in stock options (in shares) | [1] |  |  | 3,743 |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  | 40 |  |  |  | 40 |  |  |  |  |  | 40 |  |
Vesting of restricted stock units and performance share units (in shares) | [1] |  |  | 720,951 |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) | [1] |  |  | 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) | [1] |  |  | (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) | [1] |  |  |  |  |  | (701,361) |  |  |  |  |  |  |
Repurchases of common stock |  | (45,175) |  |  |  |  | $ (45,175) | [1] |  |  |  | (45,175) |  |
Distributions to noncontrolling interest holders |  | (10,935) |  |  |  |  |  |  |  |  |  |  |  | (10,935)
Ending balance (in shares) at Dec. 31, 2019 | [1] |  |  | 38,584,854 |  |  | (10,294,117) |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 |  | 395,046 | $ (79) | $ 4 | [1] | 2,310,393 | $ (922,666) | [1] | (1,032,876) | $ (79) | 39,081 | 393,936 | $ (79) | 1,110
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (322,152) |  |  |  |  |  |  | (287,931) |  | (35,972) | (323,903) |  | 1,751
Vesting of restricted stock units and performance share units (in shares) | [1] |  |  | 784,385 |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) | [1] |  |  | 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) | [1] |  |  | (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 | [1] |  |  | 39,142,896 |  |  | (10,294,117) |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 |  | $ 107,674 |  | $ 4 | [1] | $ 2,348,114 | $ (922,666) | [1] | $ (1,320,886) |  | $ 3,109 | $ 107,675 |  | $ (1)
[1] | All share information and balances have been retroactively adjusted to reflect a reverse stock split. See Note 13, Stockholders' Equity, for additional information.

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