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Assets and Liabilities Measured at Fair Value (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
May 31, 2012
Jun. 30, 2009
Jun. 30, 2013
Jun. 30, 2013
Input
Jun. 30, 2013
Recurring [Member]
Warrant liability [Member]
Jun. 30, 2013
Recurring [Member]
Warrant liability [Member]
Level 1 [Member]
Jun. 30, 2013
Recurring [Member]
Warrant liability [Member]
Level 2 [Member]
Jun. 30, 2013
Recurring [Member]
Warrant liability [Member]
Level 3 [Member]
Jun. 30, 2013
Recurring [Member]
Money market funds [Member]
Jun. 30, 2013
Recurring [Member]
Money market funds [Member]
Level 1 [Member]
Jun. 30, 2013
Recurring [Member]
Money market funds [Member]
Level 2 [Member]
Jun. 30, 2013
Recurring [Member]
Money market funds [Member]
Level 3 [Member]
Jun. 30, 2009
2009 Warrants [Member]
Jun. 30, 2013
2009 Warrants [Member]
Mar. 13, 2013
2009 Warrants [Member]
May 31, 2012
2012 Warrants [Member]
Jun. 30, 2013
2012 Warrants [Member]
Mar. 13, 2013
2012 Warrants [Member]
Derivative warrant liability [Abstract]                                    
Number of inputs used for valuation of warrants       6                            
Sale of common stock (in shares) 15.3 0.9                                
Issuance of warrants to purchase common shares (in shares) 4.6 1.0                                
Gross proceeds from issuance of common stock $ 21,500,000 $ 3,000,000                                
Proceeds from issuance of common stock 21,100,000 2,700,000                     2,200,000     3,400,000    
Exercise price of warrants (in dollars per share)                           $ 1.20     $ 1.20  
Warrants outstanding (in shares)                             1.0     4.4
Term of warrant                         5 years     3 years    
Pre-tax derivative instrument income     5,100,000 2,800,000                            
Expected volatility (in hundredths)                           95.60%     91.75%  
Risk-free interest rates (in hundredths)                           0.15%     0.36%  
Expected life                           1 year     2 years  
Assets [Abstract]                                    
Total Assets                 1,956,000 1,956,000 0 0            
Liabilities [Abstract]                                    
Total Liabilities         366,000 0 0 366,000                    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]                                    
Beginning balance as of December 31, 2012       3,427,000                            
Total change in the fair value of the liability included in earnings       (2,842,000)                            
Fair value of warrants exercised       (219,000)                            
Ending balance as of March 31, 2013     $ 366,000 $ 366,000