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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Balance Sheet Accounts Impacted by Cumulative Effect of Adoption (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid expenses and other current assets | $ 40,441 | $ 82,073 |
Other non-current assets | 34,327 | 28,605 |
Accrued merchant and supplier payables | 410,963 | 540,940 |
Accrued expenses and other current liabilities | (294,999) | (260,192) |
Accumulated deficit | $ 1,320,886 | $ 1,032,876 |
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid expenses and other current assets |  |  | $ (4,007)
Other non-current assets |  |  | (10,223)
Accrued merchant and supplier payables |  |  | 64,970
Accrued expenses and other current liabilities |  |  | (13,188)
Other non-current liabilities |  |  | 3,443
Accumulated deficit |  |  | $ (88,945)

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