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Basis of Presentation (Details)				3 Months Ended		12 Months Ended
	Dec. 26, 2019 USD ($)	Aug. 01, 2019 USD ($)	Mar. 01, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 KRW (₩)	Dec. 26, 2019 KRW (₩)	Aug. 01, 2019 KRW (₩)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss				$ 32,541,054	$ 29,219,262
Working capital				243,200,000
Retained earnings (accumulated deficit)				(772,326,709)		$ (739,785,655)
Cash, cash equivalents, and short-term investments				270,000,000
Long-term investments				21,200,000
Proceeds from issuance of stock				208,241,933	$ 907,330
Common stock | Sales Agreement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from issuance of stock				208,200,000		9,100,000
6.50% Convertible Senior Notes Due 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal amount				$ 78,500,000
6.50% Convertible Senior Notes Due 2024 | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from issuance of debt			$ 75,700,000			$ 75,700,000
Stated interest rate			6.50%	6.50%		6.50%	6.50%
Principal amount			$ 78,500,000.0	$ 78,500,000.0
August 2019 Convertible Bonds
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal amount				$ 14,767,171
August 2019 Convertible Bonds | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from issuance of debt		$ 14,500,000				$ 14,500,000
Stated interest rate		1.00%		1.00%		1.00%	1.00%		1.00%
Principal amount		$ 15,000,000.0				$ 15,000,000.0	₩ 18,000,000,000		₩ 18,000,000,000
December 2019 Convertible Bonds
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal amount				$ 3,855,872
December 2019 Convertible Bonds | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from issuance of debt	$ 4,000,000					$ 4,000,000
Stated interest rate	1.00%			1.00%		1.00%	1.00%	1.00%
Principal amount	$ 4,100,000					$ 4,100,000.0	₩ 4,700,000,000.0	₩ 4,700,000,000.0
Geneos Therapeutics, Inc.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-controlling interest				48.00%
VGX Animal Health, Inc
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-controlling interest				15.00%

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