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v3.20.1

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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