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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets | $ 18,992 |  |
Operating lease liabilities | (6,387) |  |
Operating lease liabilities, long-term | (16,822) |  |
Retained earnings | $ (917,336) |  | $ (771,925)
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets |  | $ 15,633 |
Operating lease liabilities |  | (4,344) |
Operating lease liabilities, long-term |  | (12,405) |
Retained earnings |  | $ (1,116) |

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