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Convertible Debt - Balance of Convertible Bonds and Notes (Details) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 KRW (₩) | Dec. 26, 2019 USD ($) | Dec. 26, 2019 KRW (₩) | Aug. 01, 2019 USD ($) | Aug. 01, 2019 KRW (₩) | Mar. 01, 2019 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance cost | $ (2,800,000) |  |  |  |  |  |  |
6.50% Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount | 78,500,000 |  |  |  |  |  |  |
Unamortized debt discount | (13,356,690) |  |  |  |  |  |  | $ (18,600,000)
Unamortized debt issuance cost | (1,838,336) |  |  |  |  |  |  |
Accrued interest | 425,208 |  |  |  |  |  |  |
Total | 63,730,182 |  |  |  |  |  |  |
August 2019 Convertible Bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount | 14,767,171 |  |  |  |  |  |  |
Unamortized debt discount | (5,980,204) |  |  |  |  |  |  |
Unamortized debt issuance cost | (225,603) |  |  |  |  |  |  |
Accretion of premium associated with the Bonds | 357,994 |  |  |  |  |  |  |
Accrued interest | 36,918 |  |  |  |  |  |  |
Total | 8,956,276 |  |  |  |  |  |  |
December 2019 Convertible Bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount | 3,855,872 |  |  |  |  |  |  |
Unamortized debt issuance cost | (43,740) |  |  |  |  |  |  |
Accretion of premium associated with the Bonds | 46,988 |  |  |  |  |  |  |
Accrued interest | 9,747 |  |  |  |  |  |  |
Total | 3,868,867 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total | 124,577,000 |  |  |  |  |  |  |
Convertible Debt | 6.50% Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount | 78,500,000.0 |  |  |  |  |  |  | $ 78,500,000.0
Total | 98,911,000 |  |  |  |  |  |  |
Convertible Debt | August 2019 Convertible Bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 15,000,000.0 | ₩ 18,000,000,000 |  |  | $ 15,000,000.0 | ₩ 18,000,000,000 |
Unamortized debt discount |  |  |  |  |  | $ (7,300,000) |  |
Total | 20,344,000 |  |  |  |  |  |  |
Convertible Debt | December 2019 Convertible Bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 4,100,000.0 | ₩ 4,700,000,000.0 | $ 4,100,000 | ₩ 4,700,000,000.0 |  |  |
Total | $ 5,322,000 |  |  |  |  |  |  |

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