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Convertible Debt - Schedule of Maturities (Details) - USD ($)	Jun. 30, 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	$ 65,844,260
August 2019 Convertible Bonds
Debt Instrument [Line Items]
Total	9,738,748
December 2019 Convertible Bonds
Debt Instrument [Line Items]
Total	3,979,780
Convertible Debt
Debt Instrument [Line Items]
Remainder of 2020	2,646,000
2021	5,292,000
2022	5,292,000
2023	5,292,000
2024	105,361,000
Total	123,883,000
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	$ 75,000
2021	150,000
2022	150,000
2023	150,000
2024	19,270,000
Total	$ 19,795,000
Stated interest rate	1.00%	1.00%		1.00%
Debt instrument, convertible, internal rate of return	6.00%
Convertible Debt | December 2019 Convertible Bonds
Debt Instrument [Line Items]
Remainder of 2020	$ 20,000
2021	39,000
2022	39,000
2023	39,000
2024	5,040,000
Total	$ 5,177,000
Stated interest rate	1.00%	1.00%	1.00%
Debt instrument, convertible, internal rate of return	6.00%		6.00%

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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