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Convertible Debt - Balance of Convertible Bonds and Notes (Details) - Convertible Debt | Sep. 30, 2019 USD ($) | Aug. 01, 2019 USD ($) | Aug. 01, 2019 KRW (₩) | Mar. 01, 2019 USD ($)
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Korean Won Convertible Bonds Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | $ 15,052,055 | $ 15,000,000 | ₩ 18,000,000,000 |
Unamortized debt discount | (6,945,328) | $ (7,300,000) |  |
Unamortized debt issuance cost | (262,013) |  |  |
Accretion of premium associated with the Bonds | 84,569 |  |  |
Accrued interest | 25,568 |  |  |
Net carrying amount | 7,954,851 |  |  |
6.50% Convertible Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | 78,500,000 |  |  | $ 78,500,000.0
Unamortized debt discount | (14,772,356) |  |  | (18,600,000)
Unamortized debt issuance cost | (2,033,181) |  |  | $ (2,800,000)
Accrued interest | 425,208 |  |  |
Net carrying amount | $ 62,119,671 |  |  |

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