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Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 | Dec. 31, 2013
Sale of stock |  |
Proceeds from the offering, after deducting underwriting discounts and commissions |  | $ 11,955
Initial public offering |  |
Sale of stock |  |
Common stock sold (in shares) | 6,670,000 |
Offering price (in dollars per share) | $ 12.00 |
Proceeds from the offering, after deducting underwriting discounts and commissions | $ 72,000 |
Underwriters over-allotment option |  |
Sale of stock |  |
Common stock sold (in shares) | 870,000 |

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