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Convertible Debt - Narrative (Details)					3 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	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($)	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					$ 513,034	$ 2,803,755
Change in fair value of derivative liability					0	(13,221,977)
Common stock
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued (in shares) | shares							4,692,364
6.50% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Original principal amount					78,500,000
Unamortized debt issuance cost					294,495
Debt instrument, unamortized discount					$ 2,139,698
Convertible Debt | 6.50% Convertible Senior Notes Due 2024
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 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%
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					$ 463,000	2,100,000
Interest expense, contractual interest					$ 267,000	1,300,000
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						641,000
Interest expense, contractual interest						38,000
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%
Debt conversion, converted instrument, shares issued (in shares) | shares		1,009,450			1,009,450
Non-cash interest expense					$ 59,000	62,000
Interest expense, contractual interest					9,000	$ 10,000
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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