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Convertible Senior Notes - Balance of Convertible Notes (Details) - USD ($)	Jun. 30, 2019	Mar. 01, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Net carrying amount	$ 62,757,286		$ 0
Convertible Debt | 6.50% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Principal amount	78,500,000.0	$ 78,500,000.0
Unamortized debt discount on the liability component	(15,436,340)	(18,600,000)
Unamortized debt issuance cost	(2,124,567)	$ (2,800,000)
Accrued interest	1,818,193
Net carrying amount	$ 62,757,286

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