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Income Taxes (Details 2)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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%)
Stock-based compensation	(1.00%)	(2.00%)	(3.00%)
Other	(1.00%)	(1.00%)	(1.00%)
Total	32.00%	30.00%	30.00%
Valuation allowance	(33.00%)	(31.00%)	(31.00%)
Effective tax rate	(1.00%)	(1.00%)	(1.00%)

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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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