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Subsequent event (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Oct. 27, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent event |  |  |
Gross proceeds received from public offering |  | $ 1,036 | $ 2,218
Subsequent events |  |  |
Subsequent event |  |  |
Shares issued in connection with offering | 5,000,000 |  |
Offering price per share of shares issued | $ 18.25 |  |
Gross proceeds received from public offering | $ 91,300 |  |
Net proceeds received from public offering | $ 85,400 |  |
Options granted to underwriters | 750,000 |  |

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