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Income taxes (Details 2)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]    
Expected Federal Tax (34.00%) (34.00%)
State Tax (Net of Federal Benefit) (5.48%) (5.48%)
Permanent differences 0.12%
Loss of NOL benefit of closed foreign entity
Write-off of deferred tax asset 4.29%
Adjustments to deferred tax balances (8.34%)
Foreign tax credit
Other 0.05%
Change in valuation allowance 39.48% 43.36%
Effective rate of income tax 0.00% 0.00%