INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets
Net operating loss carryforwards	$ 21,204	$ 18,736
Deferred income and reserves	244us-gaap_DeferredTaxAssetsDeferredIncome	205us-gaap_DeferredTaxAssetsDeferredIncome
Depreciation of fixed assets	30	53
Amortization of intangibles	2,424mark_DeferredTaxAssetsAmortization	2,854mark_DeferredTaxAssetsAmortization
Share-based compensation expense	12,030	9,681
Differences related to stock basis in equity investment	379	421
Other	175us-gaap_DeferredTaxAssetsOther	292us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	36,486us-gaap_DeferredTaxAssetsGross	32,242us-gaap_DeferredTaxAssetsGross
Valuation allowance	(35,959)	(32,236)	(29,607)
Deferred tax assets, net of valuation allowance	527us-gaap_DeferredTaxAssetsNet	6us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities
Acquired intangible assets	(25)	(25)
Depreciation of fixed assets	(521)	0
Foreign exchange gain/loss	(6)	(6)
Gross deferred tax liabilities	(552)us-gaap_DeferredIncomeTaxLiabilities	(31)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability	$ (25)us-gaap_DeferredTaxLiabilities	$ (25)us-gaap_DeferredTaxLiabilities

Deferred tax assets, Amortization

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Deferred tax assets, Depreciation of property, equipment and software

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Amount of deferred tax liability attributable to taxable temporary differences.

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-Publisher FASB

-Name Accounting Standards Codification

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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 from equity method investments.

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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.

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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 not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on foreign currency transactions.

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