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Commitments and contingencies (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Operating Leased Assets [Line Items] | ||||
| Increase (Decrease) In Short-Term Investments | $ 1,302 | |||
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Office space and warehouse facilities
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| Operating Leased Assets [Line Items] | ||||
| Rent expense, gross | $ 106,178 | $ 127,994 | $ 204,638 | $ 244,153 |
| X | ||||||||||
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- Definition
Increase (Decrease) In Short-Term Investments No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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