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Common stock (Details) (USD $) | 6 Months Ended | 27 Months Ended | 1 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Mar. 31, 2013 Common stock | Mar. 31, 2013 Issuance under private placement
Common stock |  |  |  |  |
Common stock issued in a private placement (in shares) |  |  |  | 3,888,880 |
Share Price (in dollars per share) |  |  |  | $ 9.00 |
Net proceeds from issuance of common stock | $ 32,654,000 | $ 1,000 | $ 36,695,000 |  | $ 32,652,000

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