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General and administrative expenses (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
General and administrative expenses [Abstract]      
Staff salaries $ 2,020,970 $ 1,493,475 $ 1,360,582
Share-based compensation 571,321 11,250 16,674
Office administration 590,518 245,477 466,550
Bank charges and foreign exchange 61,295 48,942 45,326
Auditors' remuneration 870,394 109,517 96,720
Other professional fees 589,720 535,857 181,948
Other administration costs 965,717 530,621 431,231
General and administrative expenses 5,669,935 2,975,139 2,599,031
Initial public offering costs $ 721,375