Accrued expenses - Summary of accrued expenses (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Salaries and allowance	$ 4,931	$ 16,351
Insurance	11,959	7,138
Others	4,023	4,089
Total accrued expenses	$ 20,913	$ 27,578

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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