Quarterly report pursuant to Section 13 or 15(d)

Commitments and contingencies (Details)

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Commitments and contingencies (Details) (Office space and warehouse facilities, USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Office space and warehouse facilities
   
Operating Leased Assets [Line Items]    
Rent expense, gross $ 244,153 $ 97,174