Business and summary of significant accounting policies - Foreign currency translation (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||
| Foreign currency transaction losses | $ (189,687) | $ (280,098) |
| X | ||||||||||
- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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