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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016
Recent accounting pronouncements |  |  |
Valuation allowance | $ 35,829 |  | $ 42,462
Accounting Standards Update 2016-09 | Adjustment |  |  |
Recent accounting pronouncements |  |  |
Reclassification to retained earnings |  | $ 300 |
Accounting Standards Update 2016-01 |  |  |
Recent accounting pronouncements |  |  |
Equity investments under cost method | 20,100 |  |
Accounting Standards Update 2016-18 |  |  |
Recent accounting pronouncements |  |  |
Restricted cash | 11,900 |  |
Accounting Standards Update 2016-15 | Proforma Adjustment |  |  |
Recent accounting pronouncements |  |  |
Cash payments - investing activities | (1,200) |  |
Cash payments - financing activities | 1,200 |  |
ASU 2018-02 | Adjustment |  |  |
Recent accounting pronouncements |  |  |
Reclassification to retained earnings | 800 |  |
Valuation allowance | $ 800 |  |

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