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Borrowings - Mann Group Promissory Notes - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Apr. 22, 2021
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
Aug. 31, 2019
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Debt Instrument [Line Items]          
Principal amount   $ 338.4   $ 338.4  
Debt issuance amount   230.0      
Mann Group | Convertible Promissory Note          
Debt Instrument [Line Items]          
Principal amount   $ 18.4   $ 18.4 $ 28.0
Senior notes, effective interest rate   7.00%   7.00%  
Conversion price of shares | $ / shares   $ 2.50   $ 2.50  
Debt issuance amount       $ 9.6 $ 7.0
Conversion of notes to common shares, shares | shares       4,000,000 2,800,000
Mann Group | Convertible Promissory Note | Accrued Interest          
Debt Instrument [Line Items]          
Debt issuance amount       $ 0.4 $ 3.0
Conversion of notes to common shares, shares | shares         1,200,000
Mann Group | Convertible Promissory Note | Subsequent Event          
Debt Instrument [Line Items]          
Repayments of debt $ 35.1        
Mann Group | New Loan Arrangement | Convertible Promissory Note          
Debt Instrument [Line Items]          
No of convertible shares     400    
Principal amount per share | $ / shares     $ 1,000    
Conversion price of shares | $ / shares     $ 2.50    
Mann Group | New Loan Arrangement | Promissory Notes          
Debt Instrument [Line Items]          
Senior notes, effective interest rate     7.00%    
Debt instrument payment term description     quarterly    
Debt instrument, date of first required interest payment     Oct. 01, 2019    
Maturity date     Nov. 03, 2024    
Mann Group | New Loan Arrangement | Promissory Notes | Subsequent Event          
Debt Instrument [Line Items]          
Senior notes, effective interest rate 2.50%        
Maturity date Dec. 31, 2025        
Mann Group | Privately Negotiated Exchange Agreement | Loan Arrangement          
Debt Instrument [Line Items]          
Common stock price per share | $ / shares     $ 2.50    
Mann Group | Privately Negotiated Exchange Agreement | Loan Arrangement | Convertible Promissory Note          
Debt Instrument [Line Items]          
Principal amount     $ 35.0    
Mann Group | Privately Negotiated Exchange Agreement | Loan Arrangement | Non-Convertible Note          
Debt Instrument [Line Items]          
Principal amount     $ 35.1