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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) revenueCategory | Oct. 01, 2021 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity | $ 210,296 |  |  | $ 107,674 | $ 395,046 | $ 382,611
Convertible senior notes, net | $ 223,403 |  |  | 229,490 |  |
Number of revenue category | revenueCategory | 3 |  |  |  |  |
Internally-developed software |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Intangible assets, useful life | 2 years |  |  |  |  |
Minimum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Intangible assets, useful life | 1 year |  |  |  |  |
Contract with third party merchants, term | 12 months |  |  |  |  |
Minimum | Computer hardware and purchased software |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Useful life of property and equipment | 3 years |  |  |  |  |
Minimum | Office Equipment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Useful life of property and equipment | 3 years |  |  |  |  |
Minimum | Furniture and fixtures and other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Useful life of property and equipment | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Intangible assets, useful life | 10 years |  |  |  |  |
Contract with third party merchants, term | 18 months |  |  |  |  |
Maximum | Computer hardware and purchased software |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Useful life of property and equipment | 5 years |  |  |  |  |
Maximum | Office Equipment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Useful life of property and equipment | 5 years |  |  |  |  |
Maximum | Furniture and fixtures and other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Useful life of property and equipment | 5 years |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity | $ 2,294,215 |  |  | 2,348,114 | 2,310,393 | 2,234,632
Accumulated Deficit |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity | $ (1,156,868) |  |  | (1,320,886) | (1,032,876) | $ (1,010,499)
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  | (18,969) | (79) |
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  | (64,319) |  |
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  | $ 45,350 | $ (79) |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Convertible senior notes, net |  |  | $ (19,000) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional Paid-in Capital |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity |  | $ 2,700 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Accumulated Deficit |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' equity |  | $ (2,700) | $ 48,000 |  |  |
3.25% Convertible Senior Notes due 2022 | Senior Notes |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Debt effective interest rate | 3.76% |  | 3.76% | 9.75% |  |

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