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Stockholders' Equity - Stock Issuances - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
May. 31, 2012
Dec. 31, 2015
Dec. 31, 2013
Oct. 20, 2015
Dec. 31, 2014
Apr. 30, 2014
Mar. 31, 2013
Dec. 31, 2012
Stockholders Equity Note [Line Items]                      
Sale of units to underwriter 9,400,000                    
Sale of common stock, net of expenses (in shares) 9,400,000 2,500,000 1,300,000 1,000,000   0          
Proceeds of common stock issued, net of related expenses $ 6,000,000                    
Warrants exercisable per share price (in dollars per share)                     $ 19.20
Number of warrants outstanding (in shares)         18,059,000 929,495   850,138     352,664
Proceeds from issuance of private placement   $ 2,600,000 $ 7,500,000 $ 21,500,000              
Net proceeds from issuance of private placement   2,500,000 6,900,000 $ 21,100,000              
Securities available subject to market conditions         $ 77,400,000            
Common stock, par value (in dollars per share)         $ 0.01     $ 0.01      
Proceeds from issuance of common stock $ 6,000,000                    
ATM Programs [Member] | Cowen and Company, LLC [Member]                      
Stockholders Equity Note [Line Items]                      
Sale of common stock, net of expenses (in shares)         1,000,000 1,000,000          
Proceeds of common stock issued, net of related expenses         $ 4,700,000 $ 4,800,000          
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  
Proceeds from issuance of common stock         4,800,000 $ 5,000,000          
Aggregate proceeds from sale of common stock under equity offering program, remaining         $ 39,900,000            
Maximum [Member]                      
Stockholders Equity Note [Line Items]                      
Warrants exercisable per share price (in dollars per share)         $ 7.04 $ 7.04   $ 7.04      
Maximum offering and selling of stock and securities that entity make to raise capital             $ 77,400,000        
Entity public float pursuant to SEC regulations             $ 75,000,000        
February 2015 Warrants [Member]                      
Stockholders Equity Note [Line Items]                      
Value of warrants issued   $ 800,000                  
Warrants exercisable per share price (in dollars per share)         $ 0.74            
Number of warrants outstanding (in shares)         1,100,000            
Warrants issued (in shares)   1,100,000                  
Proceeds from issuance of private placement   $ 2,600,000                  
Net proceeds from issuance of private placement   $ 2,500,000                  
Term period for warrants         5 years            
2013 Warrants [Member]                      
Stockholders Equity Note [Line Items]                      
Value of warrants issued     $ 1,900,000                
Warrants exercisable per share price (in dollars per share)         $ 7.04       $ 7.04    
Number of warrants outstanding (in shares)         600,000            
Warrants issued (in shares)     600,000                
Term period for warrants         5 years            
Series A Common Stock Warrants [Member]                      
Stockholders Equity Note [Line Items]                      
Number of warrants converted 7,000,000                    
Gross Proceeds From Underwriting Offering $ 7,000,000                    
Warrants exercisable per share price (in dollars per share)         $ 0.87            
Number of warrants outstanding (in shares)         7,000,000            
Series B Common Stock Warrants [Member]                      
Stockholders Equity Note [Line Items]                      
Number of warrants converted 9,400,000                    
Warrants exercisable per share price (in dollars per share)         $ 0.75            
Number of warrants outstanding (in shares)         9,400,000            
Warrants expiration date         Jan. 29, 2016            
Series A and B Common Stock Warrants [Member]                      
Stockholders Equity Note [Line Items]                      
Value of warrants issued $ 3,400,000