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Basis of Presentation (Details)				3 Months Ended		6 Months Ended		12 Months Ended
Basis of Presentation (Details)	Dec. 26, 2019 USD ($)	Aug. 01, 2019 USD ($)	Mar. 01, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 01, 2020	Dec. 31, 2019 KRW (₩)	Dec. 26, 2019 KRW (₩)	Aug. 01, 2019 KRW (₩)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss				$ 128,703,059	$ 29,387,226	$ 161,244,113	$ 58,606,488
Working capital				344,100,000		344,100,000
Retained earnings (accumulated deficit)				(901,029,768)		(901,029,768)		$ (739,785,655)
Cash, cash equivalents, and short-term investments				371,700,000		371,700,000
Proceeds from issuance of stock						329,960,855	$ 2,296,316
Common stock \| Sales Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from issuance of stock				121,700,000		330,000,000.0		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		$ 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%		6.50%
Principal amount			$ 78,500,000	$ 78,500,000		$ 78,500,000
August 2019 Convertible Bonds
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal amount				$ 14,993,753		$ 14,993,753
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%		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				$ 3,915,035		$ 3,915,035
December 2019 Convertible Bonds \| Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from issuance of debt	$ 4,000,000.0							$ 4,000,000.0
Stated interest rate	1.00%			1.00%		1.00%		1.00%		1.00%	1.00%
Principal amount	$ 4,100,000							$ 4,100,000		₩ 4,700,000,000	₩ 4,700,000,000
Geneos Therapeutics, Inc.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-controlling interest									47.00%
VGX Animal Health, Inc
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-controlling interest				15.00%		15.00%