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Fair Value Measurements (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Fair value measurements    
Transfer of assets from level 1 to level 2 $ 0  
Transfer of assets from level 2 to level 1 0  
Transfer of liabilities from level 1 to level 2 0  
Transfer of liabilities from level 2 to level 1 0  
Warrant liability
   
Assumptions used to determine the fair value    
Risk-free interest rate (as a percent) 2.10% 1.20%
Expected volatility (as a percent) 85.90% 93.50%
Remaining contractual term 7 years 6 months 22 days 8 years 3 months 22 days
Expected dividend yield (as a percent) 0.00% 0.00%
Recurring | Total
   
Fair value measurements    
Liabilities 3,048,000 735,000
Recurring | Total | Warrant liability
   
Fair value measurements    
Liabilities 163,000 184,000
Recurring | Total | Exchangeable share liability
   
Fair value measurements    
Liabilities 2,885,000 551,000
Recurring | Significant Unobservable Inputs (Level 3)
   
Fair value measurements    
Liabilities 3,048,000 735,000
Recurring | Significant Unobservable Inputs (Level 3) | Warrant liability
   
Fair value measurements    
Liabilities 163,000 184,000
Recurring | Significant Unobservable Inputs (Level 3) | Exchangeable share liability
   
Fair value measurements    
Liabilities 2,885,000 551,000
Non-recurring
   
Fair value measurements    
Non-financial assets 0  
Non-financial liabilities 0  
Carrying amount | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Fair value measurements    
Cash equivalents $ 300,000 $ 1,300,000