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FAIR VALUES OF ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets and liabilities measured at fair value on a recurring basis
Derivative warrant liability	$ 7,224us-gaap_DerivativeLiabilitiesCurrent	$ 0us-gaap_DerivativeLiabilitiesCurrent	$ 14,585us-gaap_DerivativeLiabilitiesCurrent	$ 35,473us-gaap_DerivativeLiabilitiesCurrent
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Derivative warrant liability	7,224
Assets measured at fair value		0
Liabilities measured at fair value		0
Recurring basis \| Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative warrant liability	7,224
Nonrecurring basis
Assets and liabilities measured at fair value on a recurring basis
Assets measured at fair value	0	0
Liabilities measured at fair value	$ 0	$ 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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