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Income taxes (restated) (Details 2)	12 Months Ended
Income taxes (restated) (Details 2)	Dec. 31, 2012	Dec. 31, 2011
Income taxes at the federal statutory rates	35.00%	35.00%
Foreign rate differential	42.00%	45.00%
Change in valuation allowance	(7.00%)	(12.00%)
Effective rate of income tax	0.00%	(2.00%)

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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