INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 161,422	$ 164,105
Reserves not currently deductible	7,547	7,367
Tax credit carryforwards	849	849
Depreciation	6,006	6,663
Deferred revenue	1,186us-gaap_DeferredTaxAssetsDeferredIncome	1,974us-gaap_DeferredTaxAssetsDeferredIncome
Other	(161)us-gaap_DeferredTaxAssetsOther	611us-gaap_DeferredTaxAssetsOther
Total deferred tax asset	176,849us-gaap_DeferredTaxAssetsGross	181,569us-gaap_DeferredTaxAssetsGross
Valuation allowance	(176,786)	(181,499)
Net deferred tax asset	63us-gaap_DeferredTaxAssetsNet	70us-gaap_DeferredTaxAssetsNet
Deferred tax liability	(192)us-gaap_DeferredIncomeTaxLiabilities	(49)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset (liability)	$ (129)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 21us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves not separately disclosed.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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