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Fair Value Measurements - Additional Information (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
MutualFund
shares
Dec. 31, 2020
USD ($)
MutualFund
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Number of mutual fund investment | MutualFund 2 2
Warrant 2,065,000  
IronNet [Member] | Common Stock [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Restricted shares 1,300,000  
IronNet [Member] | Common Stock [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Restricted shares 1,250,000  
IronNet [Member] | PIPE Related Common Shares [Member] | Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Non-restricted shares 272,529  
Non-Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other liabilities, fair value disclosure, non-recurring | $ $ 0 $ 0