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Neubase Asset Sale - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Apr. 26, 2021 | Sep. 30, 2021
Proceeds received from the disposal of business |  | $ 796
Gain (Loss) on Disposition of Assets |  | 2,691
Neubase Therapeutics Inc [Member] |  |
Investment owned number of shares placed in escrow account | 162,260 |
Shares eligible for release from escrow |  | $ 54,070
Neubase Therapeutics Inc [Member] | Investment In PNAI [Member] |  |
Proceeds received from the disposal of business | $ 796 |
Disposal group including discontinued operations shares received for disposal | 308,635 |
Investments owned market value | $ 1,759 |

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