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Stockholders Equity - Warrants - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
May. 31, 2012
Sep. 30, 2015
Class Of Warrant Or Right [Line Items]          
Common stock sold through the program (in shares) 9,400,000 2,500,000 1,300,000 1,000,000  
Proceeds from issuance of private placement   $ 2.6 $ 7.5 $ 21.5  
Net proceeds from issuance of private placement   $ 2.5 $ 6.9 $ 21.1  
Sale of units to underwriter 9,400,000        
Proceeds of common stock issued, net of related expenses $ 6.0        
Series A Common Stock Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants exercisable per share price (in dollars per share)         $ 0.87
Number of warrants outstanding (in shares)         7,000,000
Number of warrants converted 7,000,000        
Gross Proceeds From Underwriting Offering $ 7.0        
Warrants expiry period         5 years
Series B Common Stock Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants exercisable per share price (in dollars per share)         $ 0.75
Number of warrants outstanding (in shares)         9,400,000
Number of warrants converted 9,400,000        
Warrants expiry period         90 days
Series A and B Common Stock Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Estimated fair value allocated to warrants issued $ 3.4        
2012 Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants issued (in shares)       300,000  
Estimated fair value allocated to warrants issued       $ 3.4  
Warrants Exercised (in shares)         200,000
Net proceeds from exercise of warrants         $ 0.1
Term period for warrants         3 years
Warrants expiration date         May 31, 2015
February 2015 Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants issued (in shares)   1,100,000      
Estimated fair value allocated to warrants issued   $ 0.8      
Term period for warrants         5 years
Warrants exercisable per share price (in dollars per share)         $ 0.74
Number of warrants outstanding (in shares)         1,100,000
2013 Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants issued (in shares)     600,000    
Estimated fair value allocated to warrants issued     $ 1.9    
Term period for warrants         5 years
Warrants exercisable per share price (in dollars per share)         $ 7.04
Number of warrants outstanding (in shares)         600,000