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Convertible Debt - Narrative (Details)			3 Months Ended
	Dec. 26, 2019 USD ($) shares	Mar. 01, 2019 USD ($) day $ / shares	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 26, 2019 KRW (₩)
Debt Instrument [Line Items]
Accumulated deficit			$ (1,287,103,438)			$ (1,209,855,522)
Convertible senior notes			16,207,864			14,959,647
Non-cash interest expense			313,488	$ 513,034
Additional paid-in capital			(1,642,419,819)			$ (1,609,589,797)
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Accumulated deficit					$ 1,800,000
Convertible senior notes					1,500,000
Additional paid-in capital					$ 3,300,000
Convertible senior notes
Debt Instrument [Line Items]
Original principal amount			78,500,000
Unamortized debt issuance cost			296,051
Convertible Debt
Debt Instrument [Line Items]
Unamortized debt issuance cost			$ 2,200,000
Convertible Debt | Convertible senior notes
Debt Instrument [Line Items]
Original principal amount		$ 78,500,000
Stated interest rate		6.50%	6.50%
Proceeds from issuance of debt		$ 75,700,000
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, effective interest rate			13.10%
Unamortized debt issuance cost			$ 592,000
Non-cash interest expense			313,000	463,000
Interest expense, contractual interest			267,000	$ 267,000
Debt instrument, convertible, conversion ratio		0.1858045
Convertible Debt | December 2019 Bonds
Debt Instrument [Line Items]
Original principal amount	$ 4,100,000						₩ 4,700,000,000
Stated interest rate	1.00%						1.00%
Proceeds from issuance of debt	$ 4,000,000
Debt conversion, converted instrument, shares issued (in shares) | shares	1,009,450
Debt instrument, effective interest rate				6.20%
Non-cash interest expense				$ 59,000
Interest expense, contractual interest				$ 9,000
Conversion of carrying value			$ 4,400,000
Convertible Debt | December 2019 Bonds | Initial Conversion Price
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio	0.0002147766

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Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock.

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