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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 13, 2020 | Mar. 10, 2020 | Feb. 21, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock [Member] |  |  |  |  |
Stock Transactions [Abstract] |  |  |  |  |
Number of shares of common stock sold (in shares) |  |  |  | 1,860,483 | 7,510,555
ATM Agreement [Member] | Common Stock [Member] |  |  |  |  |
Stock Transactions [Abstract] |  |  |  |  |
Number of shares of common stock sold (in shares) |  |  |  | 1,860,483 | 7,510,555
Average sales price per common share (in dollars per share) |  |  |  | $ 5.84 | $ 3.71
Aggregate proceeds from sales of common stock |  |  |  | $ 10,866 | $ 27,837
Sales commissions, fees and other costs associated with issuance of common stock |  |  |  | $ 326 | $ 785
Subsequent Event [Member] |  |  |  |  |
Stock Transactions [Abstract] |  |  |  |  |
Options exercised (in shares) |  | 151,308 |  |  |
Subsequent Event [Member] | Positive Outcome of Litigation [Member] | VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member] |  |  |  |  |
Stock Transactions [Abstract] |  |  |  |  |
Amount of final judgment with interest received | $ 454,034 |  |  |  |
Subsequent Event [Member] | ATM Agreement [Member] | Common Stock [Member] |  |  |  |  |
Stock Transactions [Abstract] |  |  |  |  |
Number of shares of common stock sold (in shares) |  |  | 1,049,382 |  |
Average sales price per common share (in dollars per share) |  |  | $ 4.41 |  |
Aggregate proceeds from sales of common stock |  |  | $ 4,627 |  |
Sales commissions, fees and other costs associated with issuance of common stock |  |  | $ 139 |  |

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