Debt - Convertible Debt Information (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||||
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May 23, 2016 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
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 | $ 1,477,798 | $ 1,477,798 | $ 1,847,254 | ||||
Convertible Debt [Member] | |||||||
Debt Instrument [Line Items] | |||||||
Amount of underwriter's discount | $ 3,700,000 | $ 3,700,000 | |||||
Effective percentage | 7.70% | 7.70% | 7.70% | 7.70% | |||
Convertible Debt [Member] | Convertible Senior Notes Due 2020 [Member] | |||||||
Debt Instrument [Line Items] | |||||||
Face amount | $ 115,000,000 | $ 115,000,000 | $ 115,000,000.0 | ||||
Debt instrument coupon rate | 7.00% | 7.00% | 7.00% | 7.00% |
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The average effective interest rate during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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://fasb.org/us-gaap/role/ref/legacyRef
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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://fasb.org/us-gaap/role/ref/legacyRef
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