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v3.19.1

Convertible Senior Notes - Balance of Convertible Notes (Details) - USD ($) | Mar. 31, 2019 | Mar. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Net carrying amount | $ 60,562,503 |  | $ 0
Convertible Debt | 6.50% Convertible Senior Notes Due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 78,500,000 | $ 78,500,000.0 |
Unamortized debt discount on the liability component | (16,141,134) | (18,600,000) |
Unamortized debt issuance cost | (2,221,571) | $ (2,800,000) |
Accrued interest | 425,208 |  |
Net carrying amount | $ 60,562,503 |  |

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