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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncement - Summary of Impact of Adoption of New Accounting Standard (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | $ 2,860 |  |
Prepaid | 5,524 |  | $ 6,776
Operating lease liabilities, current | (1,595) |  |
Operating lease liabilities, non-current | (1,364) |  |
ASU 2016-02 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | 2,410 | $ 2,410 |
Prepaid | 6,693 | (83) |
Operating lease liabilities, current | (898) | (898) |
Operating lease liabilities, non-current | $ (1,429) | $ (1,429) |

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