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Summary of Significant Accounting Policies - Narrative (Details)				3 Months Ended								12 Months Ended
	Dec. 26, 2019 USD ($)	Aug. 01, 2019 USD ($)	Mar. 01, 2019 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 KRW (₩)	Dec. 26, 2019 KRW (₩)	Aug. 01, 2019 KRW (₩)
Property, Plant and Equipment [Line Items]
Net loss from operations				$ 24,338,380	$ (19,171,336)	$ 128,703,059	$ 32,541,054	$ 37,662,038	$ 23,090,693	$ 29,387,226	$ 29,219,262	$ 166,411,157	$ 119,359,219	$ 96,967,830
Working capital				429,500,000								429,500,000
Accumulated deficit				906,196,812				739,785,655				906,196,812	739,785,655
Cash, cash equivalents, and short-term investments				411,600,000								411,600,000
Proceeds from issuance of common stock												$ 454,486,400	9,089,010	$ 29,227,776
Number of operating segments | segment												1
Allowance for doubtful accounts				0				0				$ 0	0
Finite lived intangible assets, net				3,146,770				3,693,851				3,146,770	3,693,851
Deferred tax assets, valuation allowance				159,705,000				$ 137,159,000				$ 159,705,000	137,159,000
Minimum
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life												3 years
Intangible asset, useful life												2 years
Maximum
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life												5 years
Intangible asset, useful life												18 years
6.50% Convertible Senior Notes Due 2024
Property, Plant and Equipment [Line Items]
Debt instrument, face amount				78,500,000								$ 78,500,000
December 2019 Bonds
Property, Plant and Equipment [Line Items]
Debt instrument, face amount				$ 4,327,370								$ 4,327,370
Convertible Debt | 6.50% Convertible Senior Notes Due 2024
Property, Plant and Equipment [Line Items]
Proceeds from issuance of debt			$ 75,700,000										$ 75,700,000
Stated interest rate			6.50%	6.50%				6.50%				6.50%	6.50%		6.50%
Debt instrument, face amount			$ 78,500,000
Convertible Debt | August 2019 Bonds
Property, Plant and Equipment [Line Items]
Proceeds from issuance of debt		$ 14,500,000											$ 14,500,000
Stated interest rate		1.00%		1.00%				100.00%				1.00%	100.00%		100.00%		1.00%
Debt instrument, face amount		$ 15,000,000.0						$ 15,000,000.0					$ 15,000,000.0		₩ 18,000,000,000		₩ 18,000,000,000
Convertible Debt | December 2019 Bonds
Property, Plant and Equipment [Line Items]
Proceeds from issuance of debt	$ 4,000,000.0												$ 4,000,000.0
Stated interest rate	1.00%							1.00%					1.00%		1.00%	1.00%
Debt instrument, face amount	$ 4,100,000							$ 4,100,000					$ 4,100,000		₩ 4,700,000,000	₩ 4,700,000,000
Common stock | Sales Agreement
Property, Plant and Equipment [Line Items]
Proceeds from issuance of common stock												$ 454,500,000	$ 9,100,000
Patents
Property, Plant and Equipment [Line Items]
Intangible asset, useful life												17 years

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