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Income Taxes (Details 2) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | (3.00%) |  | (1.00%)
Foreign withholding tax | (4.00%) |  |
Stock-based compensation |  | (1.00%) | (2.00%)
Other |  | (1.00%) | (1.00%)
Total | 27.00% | 32.00% | 30.00%
Valuation allowance | (35.00%) | (33.00%) | (31.00%)
Effective tax rate | (8.00%) | (1.00%) | (1.00%)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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