Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Commitments and contingencies [Abstract]

Schedule of Minimum Future Commitments for Operating Leases

Minimum future commitments under these agreements payable as of June 30, 2013 are as follows:

	$
Remaining 2013		595,160
2014		986,825
2015		919,627
2016		864,225
		3,365,837