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Initial Public Offering (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 02, 2013
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2013
Proceeds from issuance of common stock     $ 122,906,000 $ 80,517,000
Common Stock        
Sale of common stock   8,625,000 8,625,000 14,639,500
IPO        
Proceeds from initial public offering net of underwriting and other expenses $ 72,500,000      
IPO | Common Stock        
Sale of common stock 14,639,500      
IPO price (in dollars per share) $ 5.50      
Proceeds from issuance of common stock $ 80,517,250