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Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Jul. 16, 2015
Feb. 28, 2015
Oct. 31, 2013
May. 31, 2012
Jun. 30, 2015
Dec. 31, 2014
Subsequent Event [Line Items]            
Common stock sold through the program (in shares)   2,500,000 1,300,000 1,000,000    
Common stock, par value (in dollars per share)         $ 0.01 $ 0.01
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Sale of units to underwriter 9,350,000          
Common stock sold through the program (in shares) 9,350,000          
Common stock, par value (in dollars per share) $ 0.01          
Exercise price of Warrants (in dollars per share) $ 0.74          
Proceeds from issuance of common stock $ 6.0          
Subsequent Event [Member] | Series A Common Stock Warrants [Member]            
Subsequent Event [Line Items]            
Number of warrants converted 7,012,500          
Warrants to purchase common stock (in shares) 7,012,500          
Partners capital account per unit value $ 0.75          
Gross proceeds from underwritten public offering $ 7.0          
Exercise price of Warrants (in dollars per share) $ 0.87          
Warrants expiry period 5 years          
Subsequent Event [Member] | Series B Common Stock Warrants [Member]            
Subsequent Event [Line Items]            
Number of warrants converted 9,350,000          
Warrants to purchase common stock (in shares) 9,350,000          
Exercise price of Warrants (in dollars per share) $ 0.75          
Warrants expiry period 90 days