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Convertible Debt - Narrative (Details)			3 Months Ended		9 Months Ended
	Aug. 01, 2019 USD ($) $ / shares	Mar. 01, 2019 USD ($) day $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Aug. 01, 2019 KRW (₩)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Non-cash interest expense			$ 2,428,671	$ 0	$ 5,279,702	$ 0
Derivative liability			4,503,918		4,503,918			$ 0
Change in fair value of derivative liability			2,551,453	$ 0	2,551,453	$ 0
Korean Won Convertible Bonds Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.00%						1.00%
Principal amount	$ 15,000,000		15,052,055		15,052,055		₩ 18,000,000,000
Proceeds from issuance of debt	$ 14,500,000
Debt instrument, convertible, internal rate of return	6.00%						6.00%
Debt Instrument, Convertible, Required Bondholder Approval, Percentage	25.00%
Debt instrument, convertible, carrying amount of equity component	$ 7,100,000
Unamortized debt issuance cost			262,013		262,013
Debt instrument, unamortized discount	$ 7,300,000		$ 6,945,328		$ 6,945,328
Debt instrument, effective interest rate			29.40%		29.40%
Non-cash interest expense			$ 374,000		$ 307,000
Interest expense, contractual interest			26,000		26,000
Derivative liability			4,500,000		4,500,000
Change in fair value of derivative liability			$ 2,600,000		$ 2,400,000
6.50% Convertible Senior Notes Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		6.50%	6.50%		6.50%
Principal amount		$ 78,500,000.0	$ 78,500,000		$ 78,500,000
Proceeds from issuance of debt		75,700,000			75,700,000
Debt instrument, convertible, carrying amount of equity component		$ 62,200,000
Debt instrument, convertible, conversion ratio		0.1858045
Debt instrument, convertible conversion price (in dollars per share) | $ / shares		$ 5.38
Debt instrument, convertible, threshold percentage of stock price trigger		130.00%
Debt instrument, convertible, threshold trading days | day		20
Debt instrument, convertible, threshold consecutive trading days | day		30
Debt instrument, redemption price percentage		100.00%
Unamortized debt issuance cost		$ 2,800,000	2,033,181		2,033,181
Debt instrument, unamortized discount		$ 18,600,000	$ 14,772,356		$ 14,772,356
Debt instrument, effective interest rate			13.10%		13.10%
Non-cash interest expense			$ 2,100,000		$ 4,900,000
Interest expense, contractual interest			$ 1,300,000		$ 3,100,000
Initial Conversion Price | Korean Won Convertible Bonds Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares	$ 4.00
Event Of Default | Korean Won Convertible Bonds Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible, internal rate of return	8.00%						8.00%
Maximum | After January 2, 2020 Conversion Price | Korean Won Convertible Bonds Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares	$ 2.40

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