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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