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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Aug. 27, 2015
USD ($)
$ / shares
shares
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 ($)
shares
Jun. 30, 2015
USD ($)
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
May. 31, 2015
$ / shares
Mar. 31, 2015
USD ($)
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]                            
Common Stock, Shares Authorized               290,000,000 290,000,000          
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       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               $ 0.34 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               $ 0.34 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   $ 0.3263        
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                        
August 2015 Warrants [Member]                            
Common Stock [Abstract]                            
Common stock at purchase price (in dollars per unit) | $ / shares               $ 0.34 $ 0          
Warrant exercise price (in dollars per share) | $ / shares $ 0.407             $ 0.401            
Period in which warrants will expire 5 years                          
Institutional Investors [Member]                            
Common Stock [Abstract]                            
Common stock issued (in shares) 7,499,993     13,500                    
Common Stock, Shares Authorized 14,999,993                          
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 | $   $ 22,000                        
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                        
Institutional Investors [Member] | August 2015 Warrants [Member]                            
Common Stock [Abstract]                            
Proceeds from private placement of stock | $ $ 2,200                          
Common stock at purchase price (in dollars per unit) | $ / shares $ 0.3263                          
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               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 | $                 $ 1,200   $ 700      
Warrants [Member]                            
Common Stock [Abstract]                            
Warrant exercise price (in dollars per share) | $ / shares       $ 0.5771           $ 0.3267