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Convertible Debt - Narrative (Details)					12 Months Ended
	Mar. 17, 2021 USD ($) shares	Dec. 26, 2019 USD ($)	Mar. 01, 2019 USD ($) day $ / shares	Feb. 28, 2019 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2022 USD ($)	Dec. 26, 2019 KRW (₩)
Debt Instrument [Line Items]
Accumulated deficit					$ (1,487,847,784)	$ (1,209,855,522)
Additional paid-in capital					(1,710,656,191)	(1,609,589,797)
Interest expense					1,253,952	1,936,447	$ 8,702,450
6.50% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument, face amount					78,500,000
Debt issuance costs, net					155,815
Convertible senior notes					16,614,840	14,959,647
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Accumulated deficit								$ 1,800,000
Additional paid-in capital								3,300,000
Convertible senior notes								$ 1,500,000
Convertible Debt
Debt Instrument [Line Items]
Debt issuance costs, net					$ 2,200,000
Convertible Debt | 6.50% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument, face amount			$ 78,500,000
Debt interest based on the fixed rate			6.50%		6.50%
Proceeds from issuance of debt				$ 75,700,000
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%
Debt instrument, unamortized discount			$ 16,300,000
Debt instrument, interest rate, effective percentage					13.10%
Debt issuance costs, net					$ 592,000
Interest expense					1,300,000	1,900,000	6,900,000
Interest expense, debt					1,100,000	$ 1,100,000	$ 4,100,000
Convertible Debt | December 2019 Bonds
Debt Instrument [Line Items]
Debt instrument, face amount		$ 4,100,000							₩ 4,700,000,000
Debt interest based on the fixed rate		1.00%							1.00%
Proceeds from issuance of debt		$ 4,000,000
Debt instrument, interest rate, effective percentage						6.20%
Interest expense					50,000
Interest expense, debt					$ 9,000
Debt conversion, converted instrument, shares issued (in shares) | shares	1,009,450
Carrying value of december 2019 bonds	$ 4,400,000

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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