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Operating leases (Details) (USD $) | Dec. 31, 2012
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Lease expensesincurred | $ 886,000
Primary lease Minimum payments 2013 | 942
Primary lease Minimum payments 2014 | 961
Primary lease Minimum payments 2015 | 980
Primary lease Minimum payments 2016 | 1,000
Primary lease Minimum payments 2017 | 83
Primary lease Minimum payments total | $ 3,883

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