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Convertible Debt - Narrative (Details)					3 Months Ended		12 Months Ended
	Jan. 02, 2020	Dec. 26, 2019 USD ($) $ / shares	Aug. 01, 2019 USD ($) $ / shares	Mar. 01, 2019 USD ($)	Mar. 31, 2020 USD ($) day $ / shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 KRW (₩)	Dec. 26, 2019 KRW (₩)	Aug. 01, 2019 KRW (₩)
Debt Instrument [Line Items]
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, convertible, carrying amount of equity component					$ 62,200,000
Unamortized debt issuance cost					2,800,000
Non-cash interest expense					2,803,755	$ 656,248
Derivative liability					22,041,000		$ 8,819,023
Change in fair value of derivative liability					(13,221,977)	$ 0
December 2019 Convertible Bonds
Debt Instrument [Line Items]
Principal amount					3,855,872
Unamortized debt issuance cost					$ 43,740
December 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Principal amount		$ 4,100,000					$ 4,100,000.0	₩ 4,700,000,000.0	₩ 4,700,000,000.0
Stated interest rate		1.00%			1.00%		1.00%	1.00%	1.00%
Proceeds from issuance of debt		$ 4,000,000					$ 4,000,000
Debt instrument, convertible, conversion ratio		0.0002147766
Debt instrument, effective interest rate					6.20%
Non-cash interest expense					$ 62,000
Interest expense, contractual interest					$ 10,000
Debt instrument, convertible, internal rate of return		6.00%			6.00%				6.00%
Debt instrument, convertible, required bondholder approval, percentage		25.00%
August 2019 Convertible Bonds
Debt Instrument [Line Items]
Principal amount					$ 14,767,171
Unamortized debt issuance cost					225,603
Debt instrument, unamortized discount					$ 5,980,204
August 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Principal amount			$ 15,000,000.0				$ 15,000,000.0	₩ 18,000,000,000		₩ 18,000,000,000
Stated interest rate			1.00%		1.00%		1.00%	1.00%		1.00%
Proceeds from issuance of debt			$ 14,500,000				$ 14,500,000
Debt instrument, convertible, conversion ratio	0.0002738255		0.0002110595
Debt instrument, convertible, carrying amount of equity component			$ 7,100,000
Debt instrument, unamortized discount			$ 7,300,000
Debt instrument, effective interest rate					29.40%
Non-cash interest expense					$ 641,000
Interest expense, contractual interest					$ 38,000
Debt instrument, convertible, internal rate of return			6.00%		6.00%					6.00%
Debt instrument, convertible, required bondholder approval, percentage			25.00%
Derivative liability					$ 22,000,000
Change in fair value of derivative liability					13,200,000
6.50% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Principal amount					78,500,000
Unamortized debt issuance cost					1,838,336
Debt instrument, unamortized discount				$ 18,600,000	$ 13,356,690
Debt instrument, effective interest rate					13.10%
Non-cash interest expense					$ 2,100,000
Interest expense, contractual interest					1,300,000
6.50% Convertible Senior Notes Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Principal amount				$ 78,500,000.0	$ 78,500,000.0
Stated interest rate				6.50%	6.50%		6.50%	6.50%
Proceeds from issuance of debt				$ 75,700,000			$ 75,700,000
Debt instrument, convertible, conversion ratio				0.1858045
Initial Conversion Price | December 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares		$ 4.00
Initial Conversion Price | August 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares			$ 4.00
Event Of Default | August 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible, internal rate of return			8.00%							8.00%
Maximum | December 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio		0.0003579611
Maximum | August 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio			0.0003517658
Debt instrument, convertible conversion price (in dollars per share) | $ / shares			$ 3.15
Maximum | After January 2, 2020 Conversion Price | August 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares			$ 2.40
Maximum | After July 2, 2020 Conversion Price | December 2019 Convertible Bonds | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares		$ 2.40

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