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Convertible Debt - Narrative (Details) $ / shares in Units, ₩ in Billions				3 Months Ended		6 Months Ended
	Mar. 17, 2021 USD ($) shares	Dec. 26, 2019 USD ($)	Mar. 01, 2019 USD ($) day $ / shares	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 26, 2019 KRW (₩)
Debt Instrument [Line Items]
Accumulated deficit				$ (1,395,600,749)		$ (1,395,600,749)			$ (1,209,855,522)
Additional paid-in capital				(1,693,674,022)		(1,693,674,022)			(1,609,589,797)
Convertible senior notes				16,521,352		16,521,352			$ 14,959,647
Non-cash interest expense				313,488	$ 466,726	626,976	$ 979,760
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 senior notes
Debt Instrument [Line Items]
Original principal amount				78,500,000		78,500,000
Unamortized debt issuance cost				249,306		249,306
Convertible Debt
Debt Instrument [Line Items]
Unamortized debt issuance cost				$ 2,200,000		$ 2,200,000
Convertible Debt | December 2019 Bonds
Debt Instrument [Line Items]
Original principal amount		$ 4,100,000								₩ 4.7
Stated interest rate		1.00%								1.00%
Proceeds from issuance of debt		$ 4,000,000
Debt instrument, effective interest rate					6.20%		6.20%
Non-cash interest expense							$ 50,000
Interest expense, contractual interest							9,000
Debt conversion, converted instrument, shares issued (in shares) | shares	1,009,450
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
Convertible Debt | Convertible senior notes
Debt Instrument [Line Items]
Original principal amount			$ 78,500,000
Stated interest rate			6.50%	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, effective interest rate				13.10%		13.10%
Unamortized debt issuance cost				$ 592,000		$ 592,000
Non-cash interest expense				313,000	$ 467,000	627,000	930,000
Interest expense, contractual interest				$ 267,000	$ 267,000	$ 533,000	$ 533,000

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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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