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Income taxes (Details 2) (USD $)	12 Months Ended
Income taxes (Details 2) (USD $)	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2010
Income taxes
Uncertain tax positions, reduction to deferred tax assets		$ 106,000
Changes in uncertain tax positions
Balance at the beginning of the period	106,000	392,000
Additions for current period tax positions	286,000
Balance at the end of the period	392,000	392,000
Accrued interest or penalties	$ 0	$ 0	$ 0

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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