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Basis of Presentation (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash, cash equivalents, and short-term investments | $ 85,500,000 |  |
Long-term investments | 12,700,000 |  |
Proceeds from issuance of stock | $ 14,923,263 | $ 94,347,922 |
VGX Animal Health, Inc |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 15.00% |  |
Common Stock | Sales Agreement |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Remaining authorized amount | $ 86,400,000 |  |
Proceeds from issuance of stock | $ 14,900,000 |  |
Common Stock | Underwritten Public Offering And Sales Agreement |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Proceeds from issuance of stock |  |  | $ 94,300,000

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