Income taxes - Summary of income tax provision (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Component of income (loss) before income taxes:
United States	$ (197,231)	$ (315,254)
Foreign	(216,374)	(921,918)
Loss before income tax	(413,605)	(1,237,172)
Provision for income taxes
U.S. federal
State and local	(907)	(800)
Foreign	(5,701)	7,008
Income tax benefit	(6,608)	6,208
Deferred - valuation allowance for deferred tax assets	(89,000)
Total income tax benefit (provision)	$ (95,608)	$ 6,208