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Fair value measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
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Mar. 31, 2014
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Estimate of Fair Value, Fair Value Disclosure [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Certificate Of Deposits, Fair Value Disclosure | $ 583,720 |
| Assets, Fair Value Disclosure | 583,720 |
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Fair Value, Inputs, Level 1 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Certificate Of Deposits, Fair Value Disclosure | 0 |
| Assets, Fair Value Disclosure | 0 |
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Fair Value, Inputs, Level 2 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Certificate Of Deposits, Fair Value Disclosure | 583,720 |
| Assets, Fair Value Disclosure | 583,720 |
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Fair Value, Inputs, Level 3 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Certificate Of Deposits, Fair Value Disclosure | 0 |
| Assets, Fair Value Disclosure | $ 0 |