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2.25% Convertible Senior Notes Due 2019 (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Carrying Amounts of Liability and Equity Components

The following table presents the carrying amounts of the liability and equity components:

 

Amount of the equity component(1)

 $ 45,807,685   
  

 

 

  

2.25% convertible senior notes due 2019

 $ 330,000,000   

Unamortized debt discount(2)

   (42,843,705 ) 

Unamortized transaction costs related to the debt component

   (6,526,037 ) 

Contractual coupon interest accrual

   3,733,125   

Contractual coupon interest payment

   (3,733,125 ) 
  

 

 

  

Net carrying amount

 $ 280,630,258   
  

 

 

  

 

(1) Net of $1,177,190 of transaction costs related to the equity component of the Notes.
(2) As of December 31, 2014, the remaining period over which the unamortized debt discount will be amortized is 4.5 years.
Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount and Amortization of Debt Issuance Costs

The following table presents the interest expense for the contractual interest and the accretion of debt discount and the amortization of debt issuance costs:

 

     Year ended
December 31,
2014		  

Contractual coupon interest expense

    $ 3,733,125   

Amortization of debt discount

      4,141,170   

Amortization of debt issuance costs

      568,559   
  

 

 

  

Total interest expense related to Notes

 $ 8,442,854