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Stockholders Equity - Stock Issuances - Additional Information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2015
shares
Oct. 31, 2013
shares
May. 31, 2012
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
shares
Mar. 31, 2013
USD ($)
$ / shares
Stockholders Equity Note [Line Items]              
Reverse stock split ratio       0.0625      
Common stock, shares authorized (in shares) | shares       170,000,000 170,000,000    
Common stock, par value (in dollars per share) | $ / shares       $ 0.01 $ 0.01    
Number of fractional shares were issued in connection with the reverse stock split | shares       0      
Common stock sold through the program (in shares) | shares 2,500,000 1,300,000 1,000,000        
ATM Programs [Member] | Cowen and Company, LLC [Member]              
Stockholders Equity Note [Line Items]              
Common stock, par value under sales agreement (in dollars per share) | $ / shares             $ 0.01
Aggregate proceeds from sale of common stock under equity offering program, maximum             $ 50,000,000
Common stock sold through the program (in shares) | shares         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         $ 4,700,000 $ 4,800,000  
Aggregate proceeds from sale of common stock under equity offering program, remaining       $ 39,900,000