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Marketable Securities - Details of Marketable Securities (Parenthetical) (Details) - shares | Sep. 30, 2022 | Dec. 31, 2021
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IronNet [Member] | Common Stock [Member] |  |
Marketable Securities [Line Items] |  |
Distribution of shares by sponsor | 1,288,620 | 1,338,620

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- Definition Distribution of shares by sponsor. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |