Income Taxes (Details 2)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of reconciliation of Effective income tax rate and statutory federal income tax rate
Amounts at statutory tax rates	34.00%	34.00%	34.00%
Foreign losses taxed at different rates	(1.00%)		1.00%
Stock-based compensation	(2.00%)	(3.00%)	(7.00%)
Other	(1.00%)	(1.00%)
Total	30.00%	30.00%	28.00%
Valuation allowance	(31.00%)	(31.00%)	(29.00%)
Effective tax rate	(1.00%)	(1.00%)	(1.00%)

Effective income tax rate reconciliation before valuation allowance.

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Effective income tax rate reconciliation foreign losses at different rates.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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