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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 ($)
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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