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Stockholders' Equity - Stock Issuances - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
Mar. 31, 2016
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Mar. 31, 2013
Stockholders Equity Note [Line Items]                
Common stock, par value (in dollars per share)       $ 0.01     $ 0.01  
Sale of common stock, net of expenses (in shares) 9,400,000 2,500,000 1,300,000          
Proceeds of common stock issued, net of related expenses $ 6,000,000              
ATM Programs [Member] | Cowen and Company, LLC [Member]                
Stockholders Equity Note [Line Items]                
Common stock, par value (in dollars per share)               $ 0.01
Aggregate proceeds from sale of common stock under equity offering program, maximum               $ 50,000,000
Sale of common stock, net of expenses (in shares)       50,000 1,000,000 1,000,000    
Proceeds from issuance of common stock         $ 4,800,000 $ 5,000,000    
Proceeds of common stock issued, net of related expenses       $ 17,500 $ 4,700,000 $ 4,800,000    
Aggregate proceeds from sale of common stock under equity offering program, remaining       $ 39,900,000