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Summary of Significant Accounting Policies - Narrative (Details)				12 Months Ended
	Dec. 26, 2019 USD ($)	Aug. 01, 2019 USD ($)	Feb. 28, 2019 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 KRW (₩)	Dec. 26, 2019 KRW (₩)	Aug. 01, 2019 KRW (₩)	Mar. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Net loss from operations				$ 303,658,710	$ 166,411,157	$ 119,359,219
Working capital				382,700,000
Accumulated deficit				1,209,855,522	906,196,812
Cash, cash equivalents, and short-term investments				401,300,000
Proceeds from issuance of common stock				$ 209,441,410	454,486,400	9,089,010
Number of operating segments | segment				1
Allowance for doubtful accounts				$ 0	0
Finite lived intangible assets, net				2,626,355	3,146,770
Deferred tax assets, valuation allowance				$ 237,205,000	159,705,000
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
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
Debt interest based on the fixed rate				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
Debt interest based on the fixed rate		1.00%				100.00%	100.00%		1.00%
Debt instrument, face amount		$ 15,000,000				$ 15,000,000	₩ 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					$ 4,000,000
Debt interest based on the fixed rate	1.00%					1.00%	1.00%	1.00%
Debt instrument, face amount	$ 4,100,000					$ 4,100,000	₩ 4,700,000,000	₩ 4,700,000,000
Common stock | Underwritten Public Offering
Property, Plant and Equipment [Line Items]
Proceeds from issuance of common stock				$ 162,100,000
Common stock | Sales Agreement
Property, Plant and Equipment [Line Items]
Proceeds from issuance of common stock				$ 47,700,000	$ 454,500,000	$ 9,100,000

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No definition available.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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