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Fair value measurements (Details) (Recurring basis, USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair value measurements on recurring basis
Cash and cash equivalents	$ 631,695	$ 749,517
Derivative warrant liabilities	40,502us-gaap_DerivativeLiabilities
Level 1
Fair value measurements on recurring basis
Cash and cash equivalents	631,695	748,048
Level 2
Fair value measurements on recurring basis
Cash and cash equivalents		1,469
Level 3
Fair value measurements on recurring basis
Derivative warrant liabilities	$ 40,502

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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