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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Jul. 18, 2017 | Jul. 12, 2017 | Jun. 30, 2016
Subsequent Events |  |  |
Net proceeds from the issuance of common stock |  |  | $ 57,818
Subsequent event | Common Stock |  |  |
Subsequent Events |  |  |
Number of common stock issued from underwriting agreement |  | 21,122,449 |
Price per share of common stock issued (in dollars per share) |  | $ 12.25 |
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions |  | $ 258,800 |
Net proceeds from the issuance of common stock | $ 243,200 |  |

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