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Summary of significant accounting policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Deferred Revenue, Current	$ 761,491	$ 879,944
Deferred Revenue, Revenue Recognized	$ 1,762,266	$ 563,485
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		11.30%

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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