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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
May. 05, 2015
USD ($)
$ / shares
shares
Apr. 30, 2015
USD ($)
shares
Oct. 31, 2014
$ / shares
shares
Sep. 30, 2014
USD ($)
WarrantHolder
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Sep. 10, 2014
$ / shares
Jun. 04, 2014
$ / shares
May. 31, 2014
$ / shares
Preferred Stock [Abstract]                  
Preferred stock, shares authorized (in shares)         5,000,000        
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001        
Common Stock [Abstract]                  
Period exercisable from the date of issuance     6 months 6 months 1 day          
Number of warrant holders | WarrantHolder       13          
Number of shares called by warrants (in shares)       4,000,000          
Common stock, par value (in dollars per share) | $ / shares         $ 0.001 $ 0.001      
Warrant exercise price (in dollars per share) | $ / shares       $ 2.00     $ 1.00 $ 3.00  
Period in which warrants will expire       5 years          
Warrants with reduced exercise price (in shares)     3,400,000            
Conversion price (in dollars per share) | $ / shares     $ 0.52            
Percentage of shares equal to purchase of warrants (in hundredths)     100.00%            
Proceeds from exercise of warrants | $       $ 4,000          
Warrants [Member]                  
Common Stock [Abstract]                  
Warrants exercised (in shares)         3,400,000        
October 2014 Warrants [Member]                  
Common Stock [Abstract]                  
Common stock at purchase price (in dollars per unit) | $ / shares         $ 0.56 0.49      
Period exercisable from the date of issuance         6 months        
Warrant exercise price (in dollars per share) | $ / shares         $ 0.5771        
Proceeds from exercise of warrants | $         $ 4,900        
Warrants exercised (in shares)         8,500,000        
Number of warrants outstanding (in shares)         17,500,000        
May 2015 Warrants [Member]                  
Common Stock [Abstract]                  
Common stock at purchase price (in dollars per unit) | $ / shares         $ 0.56 $ 0      
Period exercisable from the date of issuance 6 months 1 day       6 months 1 day        
Warrant exercise price (in dollars per share) | $ / shares $ 1.02       $ 1.02        
Period in which warrants will expire 5 years                
Number of common stock and warrant available in each unit of subscription agreement (in shares) 1                
Common stock issued, value | $         $ 25,000        
Each unit consist of number of common stock and warrant (in shares) 1                
Institutional Investors [Member]                  
Common Stock [Abstract]                  
Common stock issued (in shares)     13,500            
Sale of stock, price per share (in dollars per share) | $ / shares     $ 1,000            
Period in which warrants will expire     5 years            
Number of common stock and warrant available in each unit of subscription agreement (in shares) 1   1            
Common stock issued, value | $ $ 25,000                
Each unit consist of number of common stock and warrant (in shares) 1   1            
Institutional Investors [Member] | May 2015 Warrants [Member]                  
Common Stock [Abstract]                  
Proceeds from private placement of stock | $ $ 17,700                
Common stock at purchase price (in dollars per unit) | $ / shares $ 0.77                
Number of common stock and warrant available in each unit of subscription agreement (in shares) 1                
Common stock issued, value | $ $ 25,000                
Each unit consist of number of common stock and warrant (in shares) 1                
Cowen and Company, LLC [Member]                  
Common Stock [Abstract]                  
Proceeds from private placement of stock | $   $ 7,200              
Common stock issued (in shares)   5,800,000              
Common stock, par value (in dollars per share) | $ / shares                 $ 0.001
Series A Preferred Stock [Member]                  
Preferred Stock [Abstract]                  
Preferred stock, shares authorized (in shares)         5,000,000 5,000,000      
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001 $ 0.001      
Preferred stock, shares outstanding (in shares)         0 5,311      
Preferred stock, shares issued (in shares)         13,500 13,500      
Convertible preferred stock (in hundredths)         3.60% 3.60%      
Common Stock [Abstract]                  
Cashless exercise of warrants | $         $ 1,800        
Proceeds from exercise of warrants | $         100        
Series A Preferred Stock [Member] | Dividend Declared [Member]                  
Common Stock [Abstract]                  
Dividends Payable | $           $ 70      
Series A Preferred Stock [Member] | Dividend Paid [Member]                  
Common Stock [Abstract]                  
Dividends Payable | $         $ 700 $ 1,200      
Warrants [Member]                  
Common Stock [Abstract]                  
Warrant exercise price (in dollars per share) | $ / shares     $ 0.5771