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FAIR VALUE MEASUREMENTS - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Fair value measurements |  |  |
Investments in securities | $ 78,449 |  | $ 33,383
Total financial assets | 151,186 |  | 280,316
Transfers from level 1 to level 2 | 7,996 | $ 19,993 |
Convertible notes |  |  |
Fair value measurements |  |  |
Investments in securities |  |  | 388
Government debt securities |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 19,975 |  |
Investments in securities | 70,172 |  |
U.S. treasury instruments |  |  |
Fair value measurements |  |  |
Investments in securities | 7,996 |  |
U.S. treasury bills |  |  |
Fair value measurements |  |  |
Cash and cash equivalents |  |  | 44,999
Investments in securities |  |  | 32,995
Government securities money market |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 52,762 |  | 201,934
Common Stock |  |  |
Fair value measurements |  |  |
Investments in securities | 281 |  |
Level 1 |  |  |
Fair value measurements |  |  |
Total financial assets | 18,210 |  | 388
Level 1 | Convertible notes |  |  |
Fair value measurements |  |  |
Investments in securities |  |  | 388
Level 1 | Government debt securities |  |  |
Fair value measurements |  |  |
Investments in securities | 17,929 |  |
Level 1 | Common Stock |  |  |
Fair value measurements |  |  |
Investments in securities | 281 |  |
Level 2 |  |  |
Fair value measurements |  |  |
Total financial assets | 132,976 |  | 279,928
Level 2 | Government debt securities |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 19,975 |  |
Investments in securities | 52,243 |  |
Level 2 | U.S. treasury instruments |  |  |
Fair value measurements |  |  |
Investments in securities | 7,996 |  |
Level 2 | U.S. treasury bills |  |  |
Fair value measurements |  |  |
Cash and cash equivalents |  |  | 44,999
Investments in securities |  |  | 32,995
Level 2 | Government securities money market |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | $ 52,762 |  | $ 201,934

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