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Income Taxes (Details 2) | 12 Months Ended
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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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