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Convertible Debt - Schedule of Maturities (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 26, 2019 | Aug. 01, 2019 | Mar. 01, 2019
--- | --- | --- | --- | --- | ---
6.50% Convertible Senior Notes Due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 63,730,182 |  |  |  |
August 2019 Convertible Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | 8,956,276 |  |  |  |
December 2019 Convertible Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total | 3,868,867 |  |  |  |
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Remainder of 2020 | 2,691,000 |  |  |  |
2021 | 5,290,000 |  |  |  |
2022 | 5,290,000 |  |  |  |
2023 | 5,290,000 |  |  |  |
2024 | 106,016,000 |  |  |  |
Total | 124,577,000 |  |  |  |
Convertible Debt | 6.50% Convertible Senior Notes Due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Remainder of 2020 | 2,551,000 |  |  |  |
2021 | 5,103,000 |  |  |  |
2022 | 5,103,000 |  |  |  |
2023 | 5,103,000 |  |  |  |
2024 | 81,051,000 |  |  |  |
Total | $ 98,911,000 |  |  |  |
Stated interest rate | 6.50% | 6.50% |  |  | 6.50%
Convertible Debt | August 2019 Convertible Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Remainder of 2020 | $ 111,000 |  |  |  |
2021 | 148,000 |  |  |  |
2022 | 148,000 |  |  |  |
2023 | 148,000 |  |  |  |
2024 | 19,789,000 |  |  |  |
Total | $ 20,344,000 |  |  |  |
Stated interest rate | 1.00% | 1.00% |  | 1.00% |
Debt instrument, convertible, internal rate of return | 6.00% |  |  | 6.00% |
Convertible Debt | December 2019 Convertible Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Remainder of 2020 | $ 29,000 |  |  |  |
2021 | 39,000 |  |  |  |
2022 | 39,000 |  |  |  |
2023 | 39,000 |  |  |  |
2024 | 5,176,000 |  |  |  |
Total | $ 5,322,000 |  |  |  |
Stated interest rate | 1.00% | 1.00% | 1.00% |  |
Debt instrument, convertible, internal rate of return | 6.00% |  | 6.00% |  |

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