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Common stock (Narrative) (Details) (USD $) | 12 Months Ended
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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 |

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