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Fair value of financial instruments (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Estimated Fair Value of Private Placement Warrants Publicly Traded Stock Pricing Approach

As of June 30, 2013 and December 31, 2012, the Company estimated the fair value of its Private Placement Warrants with a publicly traded stock pricing approach using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the following as of:

 

     June 30, 2013     December 31, 2012  

Market value of the Company’s common stock

   $ 33.59      $ 16.18   

Exercise price

   $ 13.00      $ 13.00   

Risk-free interest rate

     0.61 %     0.42

Estimated price volatility

     45.00     45.00

Marketability discount

     10.00 %     15.00

Contractual term

     2.83 years        3.33 years   

Dividend yield

     —         —     
Financial Liability Measured at Fair Value on Recurring Basis

The following table summarizes fair value measurement by level as of June 30, 2013, for the Company’s level 3 financial liability measured at fair value on a recurring basis:

 

     Level 1      Level 2      Level 3  

Private placement warrants liability

     —          —        $ 9,920   
        

 

 

 

The following table summarizes fair value measurements by level as of December 31, 2012, for the Company’s level 3 financial liability measured at fair value on a recurring basis:

 

     Level 1      Level 2      Level 3  

Private placement warrants liability

     —          —        $ 3,666   
        

 

 

 
Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument

The following table summarizes the change in the estimated fair value of the Company’s Level 3 financial instrument as of June 30, 2013:

 

Balance at December 31, 2012

   $ 3,666   

Fair value of private placement warrants exercised

     (2,799

Increase in the value of private placement warrants

     9,053   
  

 

 

 

Balance at June 30, 2013

   $ 9,920