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2.25% Convertible Senior Notes Due 2019 (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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