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Convertible Debt - Narrative (Details)					3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 03, 2020 $ / shares shares	Dec. 26, 2019 USD ($) $ / shares shares	Aug. 01, 2019 USD ($)	Mar. 01, 2019 USD ($) day $ / shares	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Aug. 31, 2020 USD ($)	Dec. 26, 2019 KRW (₩)	Aug. 01, 2019 KRW (₩)
Debt Instrument [Line Items]
Non-cash interest expense					$ 466,726	$ 2,846,641	$ 979,760	$ 5,650,396
Change in fair value of derivative liability					0	(97,755,000)	0	(110,976,977)
Convertible senior notes
Debt Instrument [Line Items]
Original principal amount					78,500,000		78,500,000
Unamortized debt issuance cost					270,302		270,302
Debt instrument, unamortized discount					$ 1,963,908		$ 1,963,908
August 2019 Bonds | Common stock
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued (in shares) | shares									4,692,364
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%
Carrying value				$ 62,200,000					$ 52,500,000
Unamortized debt issuance cost				2,800,000
Debt instrument, unamortized discount				$ 18,600,000
Debt instrument, effective interest rate					13.10%		13.10%
Debt conversion, converted instrument principal amount									$ 62,100,000
Debt conversion, converted instrument, shares issued (in shares) | shares									11,535,660
Fair value of date conversion									$ 43,700,000
Gain on extinguishment of debt									8,800,000
Non-cash interest expense					$ 467,000	2,100,000	$ 930,000	4,200,000
Interest expense, contractual interest					$ 267,000	1,300,000	$ 533,000	2,600,000
Convertible Debt | August 2019 Bonds
Debt Instrument [Line Items]
Original principal amount			$ 15,000,000.0									₩ 18,000,000,000
Stated interest rate			1.00%									1.00%
Proceeds from issuance of debt			$ 14,500,000
Debt instrument, convertible, conversion ratio	0.0002756873
Debt instrument, convertible conversion price (in dollars per share) | $ / shares	$ 3.14
Carrying value			7,100,000
Debt instrument, unamortized discount			$ 7,300,000
Debt conversion, converted instrument, shares issued (in shares) | shares	4,962,364
Gain on extinguishment of debt									8,200,000
Non-cash interest expense						672,000		1,300,000
Interest expense, contractual interest						37,000		75,000
Fair value of derivative liability										$ 84,500,000
Change in fair value of derivative liability									$ 75,700,000
Convertible Debt | August 2019 Bonds | Initial Conversion Price
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio	0.0002110595
Debt instrument, convertible conversion price (in dollars per share) | $ / shares	$ 4.00
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		$ 4,000,000.0
Debt instrument, effective interest rate					6.20%		6.20%
Debt conversion, converted instrument, shares issued (in shares) | shares		1,009,450					1,009,450
Non-cash interest expense						60,000	$ 50,000	122,000
Interest expense, contractual interest						$ 10,000	9,000	$ 20,000
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
Debt instrument, convertible conversion price (in dollars per share) | $ / shares		$ 4.00

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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