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RECENT ACCOUNTING PRONOUNCEMENTS - Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Right-of-use assets | $ 0 | $ 12,058 | $ 18,500 |  |
Lease liabilities |  | 12,477 | $ 18,500 |  |
Retained earnings (accumulated deficit) | 295,118 | 155,146 |  | $ 289,134 |
Equity securities, FV-NI, realized gain (loss) | 3,500 |  |  |  |
Restricted cash | 1,420 | $ 3,153 |  |  | $ 700
Adjustments for ASC 606 |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Retained earnings (accumulated deficit) | 25,481 |  |  | $ 16,600 | $ 16,631
Accounting Standards Update 2016-01 |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Retained earnings (accumulated deficit) | $ (2,900) |  |  |  |

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