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Stockholders' Equity - Warrants -Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
Mar. 31, 2016
Class Of Warrant Or Right [Line Items]        
Sale of common stock, net of expenses (in shares) 9,400,000 2,500,000 1,300,000  
Proceeds from issuance of private placement   $ 2.6 $ 7.5  
Net proceeds from issuance of private placement   $ 2.5 $ 6.9  
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)       $ 0.355
Number of warrants outstanding (in shares)       8,700,000
Number of warrants converted 7,000,000     1,700,000
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]        
Number of warrants converted 9,400,000      
Warrants exercised (in shares)       2,200,000
Net proceeds from exercise of warrants       $ 0.8
Remaining outstanding warrants expired       7,100,000
Warrants expiration date       Jan. 29, 2016
Series A and B Common Stock Warrants [Member]        
Class Of Warrant Or Right [Line Items]        
Value of warrants issued $ 3.4      
2013 Warrants [Member]        
Class Of Warrant Or Right [Line Items]        
Warrants issued (in shares)     600,000  
Value of warrants issued     $ 1.9  
Warrants exercisable per share price (in dollars per share)       $ 7.04
Number of warrants outstanding (in shares)       600,000
Term period for warrants       5 years
February 2015 Warrants [Member]        
Class Of Warrant Or Right [Line Items]        
Warrants issued (in shares)   1,100,000    
Value of warrants issued   $ 0.8    
Warrants exercisable per share price (in dollars per share)       $ 0.355
Number of warrants outstanding (in shares)       1,100,000
Term period for warrants       5 years