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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Asset:
Marketable securities, available-for-sale	$ 191,799	$ 9,556
Liabilities:
Derivative liability related to warrants	38,810	27,990
Recurring basis
Asset:
Marketable securities, available-for-sale	191,799	9,556
Liabilities:
Derivative liability related to warrants	38,810	27,990	$ 25,037
Business combination-related contingent consideration	59,021	11,637
Recurring basis \| Quoted prices in active markets (Level 1)
Asset:
Marketable securities, available-for-sale	0	9,556
Liabilities:
Derivative liability related to warrants	0	0
Business combination-related contingent consideration	0	0
Recurring basis \| Significant other observable inputs (Level 2)
Asset:
Marketable securities, available-for-sale	191,799	0
Liabilities:
Derivative liability related to warrants	0	0
Business combination-related contingent consideration	0	0
Recurring basis \| Significant unobservable inputs (Level 3)
Asset:
Marketable securities, available-for-sale	0	0
Liabilities:
Derivative liability related to warrants	38,810	27,990
Business combination-related contingent consideration	$ 59,021	$ 11,637	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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