Annual report pursuant to Section 13 and 15(d)

Income taxes Income taxes - Narrative (Details)

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Income taxes Income taxes - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Increase (decrease) in valuation allowance $ (7,700,000) $ 2,542,278  
Undistributed earnings of foreign subsidiaries     $ 1,281,071
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards     4,401,278
State [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards     4,049,558
Foreign [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards     $ 190,060