Income Taxes (Details2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax asset
Net operating loss carryforward	$ 4,992	$ 17,666
Stock-based compensation	8,087	3,688
Patent portfolio and other	2,865
Total deferred tax assets	15,944	21,354
Valuation Allowance	(15,944)	(21,354)
Deferred tax asset, net of allowance

Amount of deferred tax liability attributable to taxable temporary differences.

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

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-Number 210

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-Paragraph 15

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

+ References

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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 reserves and accruals.

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

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- Definition

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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