| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | - | - | - | - | - | - | - | - | - | -15 | 1 | 7 | 12 | 14 |
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| Depreciation and amortization | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 1 | 2 | 2 | 2 | 2 | 1 |
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| Stock-based compensation | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 6 | 4 | 2 | 2 | 2 |
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| Deferred income tax | -0 | - | - | - | - | - | - | - | - | -5 | 1 | 1 | 0 | -1 |
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| Loss on sale of long-lived assets | - | - | - | - | - | - | - | - | - | 0 | - | -0 | -0 | - |
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| Net foreign currency effect | -0 | 0 | -0 | -0 | -0 | 0 | 0 | -0 | -0 | 1 | 0 | -0 | 0 | 0 |
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| Provision for Other Losses | - | - | - | - | - | - | - | - | - | 5 | 0 | -4 | -1 | 0 |
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| Accounts receivable | 0 | 0 | 0 | 1 | 1 | -1 | -3 | 2 | 1 | -6 | 10 | -1 | -1 | 0 |
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| Prepaid income taxes | 3 | -5 | -4 | 1 | -2 | -1 | -0 | -0 | 1 | -0 | 2 | -1 | -1 | 0 |
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| Prepaid expenses and other | 1 | -0 | 1 | -0 | -1 | -1 | 0 | -0 | 1 | -1 | 8 | -2 | -4 | -1 |
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| Accounts payable | 12 | 6 | 3 | -7 | -1 | -2 | -2 | -0 | 3 | -1 | -3 | 1 | -1 | 2 |
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| Merchant payables | - | - | - | - | - | - | - | - | - | 44 | 12 | -35 | -12 | -4 |
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| Accrued expenses and other | 0 | 6 | 2 | -0 | -2 | -2 | -0 | - | -0 | -2 | 0 | -0 | -1 | -0 |
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| Deferred revenue | 1 | 1 | -1 | - | - | - | - | - | - | - | - | - | - | 5 |
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| Income tax payable | -0 | -0 | -0 | 1 | -0 | 0 | 0 | -0 | 0 | -1 | -0 | -0 | 1 | 1 |
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| Other liabilities | 1 | -0 | 0 | 1 | -8 | -0 | -3 | -0 | 2 | 3 | -1 | 0 | 2 | 2 |
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| Net cash provided by operating activities | 16 | 37 | 17 | 2 | 4 | 9 | 2 | 5 | 11 | 47 | -8 | -23 | 11 | 21 |
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| Proceeds from repayment of note receivable | - | - | - | - | - | - | - | - | - | - | 0 | - | 0 | - |
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| Purchases of property and equipment | 2 | 3 | 5 | 3 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Net cash used in investing activities | -2 | -4 | -4 | -3 | -1 | -1 | 2 | -4 | -1 | 2 | 0 | -1 | -0 | -0 |
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| Repurchase of common stock | 15 | 12 | 8 | 6 | 2 | 10 | 10 | 5 | 11 | 1 | 5 | 2 | 17 | 19 |
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| Proceeds from Notes Payable | - | - | - | - | - | - | - | - | - | 4 | - | - | 3 | 2 |
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| Exercise of stock options, net of taxes paid for net share settlement of equity awards | - | - | - | - | - | - | - | - | - | - | - | - | 0 | 2 |
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| Net cash used in financing activities | -15 | -12 | -8 | -6 | -20 | -15 | -10 | -5 | -9 | -7 | -11 | 1 | -14 | -19 |
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| Effect of exchange rate changes on cash and cash equivalents | - | - | - | - | - | - | - | -1 | 0 | 2 | -0 | -2 | 1 | -1 |
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| Net increase (decrease) in cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | -5 | 1 | 44 | -19 | -26 | -3 | 1 |
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| Income Taxes Paid, Net | 15 | 5 | 3 | 5 | 1 | 3 | 6 | 4 | 5 | 2 | 3 | 1 | -0 | 2 |
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| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | - | - | - | - | - | - | - | - | 4 | 3 | 2 | 2 | 1 | 1 |
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| Operating Lease, Payments | - | - | - | - | - | - | - | - | - | 5 | 4 | 3 | 3 | 3 |
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| Accrued excise tax for share repurchases | - | - | - | - | - | - | - | - | - | - | - | - | 0 | 0 |
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