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Common stock (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
June 2012 Stock
Dec. 31, 2012
May 2012 Stock
Dec. 31, 2011
November 2011 Stock
Dec. 31, 2011
CEFF 2011 Stock
Common stock issued, amount $ 10,500,000 $ 5,000,000 $ 10,500,000 $ 12,100,000
Common stock issued, shares 4,200,000 3,300,000 2,200,000 1,700,000
Common stock issuance costs $ 823,000 $ 71,000 $ 925,000 $ 635,000
Number of shares of common stock available for purchase 2,100,000 1,000,000 1,300,000