Convertible Debt (Details) - USD ($) |
3 Months Ended | ||||
|---|---|---|---|---|---|
May 23, 2016 |
Mar. 31, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
Jun. 29, 2015 |
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| Debt Instrument [Line Items] | |||||
| Repurchases of convertible debt | $ 1,000,000 | ||||
| Convertible Senior Notes Due 2020 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Amount of underwriter's discount | $ 2,401,439 | $ 2,586,166 | |||
| Convertible Debt [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Interest expense | 2,191,797 | $ 2,212,990 | |||
| Discount amortization | 184,728 | 188,235 | |||
| Deferred debt issuance amortization | 12,069 | $ 12,255 | |||
| Amount of underwriter's discount | $ 3,700,000 | ||||
| Effective percentage | 7.70% | 7.70% | |||
| Convertible Debt [Member] | Convertible Senior Notes Due 2020 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Principal amount | $ 115,000,000 | $ 115,000,000 | |||
| Coupon rate percentage | 7.00% | 7.00% | 7.00% | ||
| Interest expense | $ 1,995,000 | $ 2,012,500 | |||
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of amortization expense attributable to debt issuance costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The average effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount, after accumulated amortization, of debt discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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