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Income Taxes (Details 2) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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%
Federal tax reform - deferred rate change | (170.00%) |  |
Accounting method adoption | 11.00% |  |
Foreign losses taxed at different rates | (7.00%) | (3.00%) |
Foreign withholding tax | 1.00% | (4.00%) |
Stock-based compensation |  |  | (1.00%)
Other | (1.00%) |  | (1.00%)
Total | (132.00%) | 27.00% | 31.00%
Valuation allowance | 133.00% | (35.00%) | (32.00%)
Effective tax rate | 1.00% | (8.00%) | (1.00%)

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