Neubase Asset Sale - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
Apr. 26, 2021	Mar. 31, 2022
Gain (loss) on disposition of assets		$ 2,700
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	$ 800
Disposal group including discontinued operations shares received for disposal	308,635
Investments owned market value	$ 1,800

Amount of escrow deposit disbursements related to property acquisition in noncash investing or financing transactions.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Disposal group including discontinued operation shares received on disposal.

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