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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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