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Convertible Debt and Notes Payable - Letters of Credit (Details)	Dec. 31, 2022 letters_of_credit
Debt Disclosure [Abstract]
Number of letters of credit	4

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- Definition

Number of Letters of Credit

+ References

No definition available.

+ Details

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Namespace Prefix:	cown_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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