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Fair Value Measurements (Details) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
May. 05, 2015
Oct. 31, 2014
Sep. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2015
May. 31, 2015
Sep. 10, 2014
Jun. 04, 2014
Liabilities [Abstract]                  
Warrant liability       $ 9,793,000 $ 9,793,000 $ 18,187,000      
Warrant Liability [Abstract]                  
Warrant exercise price (in dollars per share)     $ 2.00         $ 1.00 $ 3.00
Period exercisable from the date of issuance   6 months 6 months 1 day            
Change in Level 3 warrant liability [Roll Forward]                  
Beginning balance       9,793,000          
Issuance of warrants       14,329,000          
Exercised warrants       (8,257,000)          
Change in fair value       2,322,000          
Ending balance       18,187,000 9,793,000        
Warrants [Member]                  
Liabilities [Abstract]                  
Warrant liability       10,000,000   10,000,000      
Change in Level 3 warrant liability [Roll Forward]                  
Ending balance       10,000,000          
October 2014 warrants [Member]                  
Liabilities [Abstract]                  
Warrant liability       $ 9,800,000 $ 9,800,000 $ 7,500,000      
Warrant Liability [Abstract]                  
Warrant exercise price (in dollars per share)           $ 0.5771      
Period exercisable from the date of issuance       6 months          
Expiration term of warrant       5 years          
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                  
Expected term       4 years 9 months 18 days 5 years 3 months 18 days        
Common stock market price (in dollars per share)         $ 0.49 0.56      
Risk-free interest rate (in hundredths)       1.63% 1.65%        
Expected volatility (in hundredths)         90.00%        
Resulting fair value (in dollars per share)         $ 0.38 $ 0.43      
Change in Level 3 warrant liability [Roll Forward]                  
Beginning balance       $ 9,800,000          
Ending balance       $ 7,500,000 $ 9,800,000        
October 2014 warrants [Member] | Maximum [Member]                  
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                  
Expected volatility (in hundredths)       120.00%          
October 2014 warrants [Member] | Minimum [Member]                  
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                  
Expected volatility (in hundredths)       90.00%          
May 2015 Warrant s [Member]                  
Liabilities [Abstract]                  
Warrant liability       $ 10,700,000   $ 10,700,000 $ 14,300,000    
Warrant Liability [Abstract]                  
Warrant exercise price (in dollars per share) $ 1.02         $ 1.02      
Period exercisable from the date of issuance 6 months 1 day     6 months 1 day          
Expiration term of warrant       5 years          
Common stock issued, value       $ 25,000,000          
Number of common stock within each unit (in shares)       1          
Number of warrants within each unit (in shares)       1          
Number of warrants to purchase common stock (in shares)           1      
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                  
Expected term       5 years 4 months 24 days          
Common stock market price (in dollars per share)         $ 0 $ 0.56      
Risk-free interest rate (in hundredths)       1.63% 0.00%        
Expected volatility (in hundredths)         0.00%        
Resulting fair value (in dollars per share)         $ 0 $ 0.42      
Change in Level 3 warrant liability [Roll Forward]                  
Ending balance       $ 10,700,000          
May 2015 Warrant s [Member] | Maximum [Member]                  
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                  
Expected volatility (in hundredths)       120.00%          
May 2015 Warrant s [Member] | Minimum [Member]                  
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                  
Expected volatility (in hundredths)       90.00%          
Fair Value, Measurements, Recurring [Member]                  
Assets [Abstract]                  
Cash equivalents         $ 8,144,000 $ 5,644,000      
Liabilities [Abstract]                  
Warrant liability       $ 9,793,000 9,793,000 18,187,000      
Change in Level 3 warrant liability [Roll Forward]                  
Beginning balance       9,793,000          
Ending balance       18,187,000 9,793,000        
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]                  
Assets [Abstract]                  
Cash equivalents         8,144,000 5,644,000      
Liabilities [Abstract]                  
Warrant liability       0 0 0      
Change in Level 3 warrant liability [Roll Forward]                  
Beginning balance       0          
Ending balance       0 0        
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]                  
Assets [Abstract]                  
Cash equivalents         0 0      
Liabilities [Abstract]                  
Warrant liability       0 0 0      
Change in Level 3 warrant liability [Roll Forward]                  
Beginning balance       0          
Ending balance       0 0        
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]                  
Assets [Abstract]                  
Cash equivalents         0 0      
Liabilities [Abstract]                  
Warrant liability       9,793,000 9,793,000 $ 18,187,000      
Change in Level 3 warrant liability [Roll Forward]                  
Beginning balance       9,793,000          
Ending balance       $ 18,187,000 $ 9,793,000