Borrowings - Mann Group Promissory Notes - Additional Information (Detail) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended			9 Months Ended
		Apr. 22, 2021 USD ($)	Mar. 31, 2021 USD ($)	Aug. 31, 2019 USD ($) $ / shares	Sep. 30, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Sep. 30, 2021 USD ($) $ / shares shares
Debt Instrument [Line Items]
Principal amount					$ 288,400			$ 288,400
Loss on extinguishment of debt, net					(4,930)			17,200
Debt issuance amount			$ 230,000
Mann Group | Convertible Promissory Note
Debt Instrument [Line Items]
Principal amount					$ 18,400		$ 28,000	$ 18,400
Senior notes, effective interest rate	[1]				2.50%			2.50%
Conversion price of shares | $ / shares					$ 2.50			$ 2.50
Debt issuance amount						$ 9,600	$ 7,000	$ 9,600
Conversion of notes to common shares, shares | shares						4,000,000	2,800,000	4,000,000
Repayments of debt		$ 35,100
Mann Group | Convertible Promissory Note | Accrued Interest
Debt Instrument [Line Items]
Debt issuance amount							$ 3,000	$ 400
Conversion of notes to common shares, shares | shares							1,200,000
Mann Group | Promissory Notes
Debt Instrument [Line Items]
Debt instrument fair value in excess of face amount					$ 18,400			18,400
Loss on extinguishment of debt, net					22,100			22,100
Debt premium recognized in additional paid-in capital					$ 22,100			$ 22,100
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		2.50%		7.00%
Debt instrument payment term description				quarterly
Debt instrument, date of first required interest payment				Oct. 01, 2019
Maturity date		Dec. 31, 2025		Nov. 03, 2024
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				$ 35,000
Mann Group | Privately Negotiated Exchange Agreement | Loan Arrangement | Non-Convertible Note
Debt Instrument [Line Items]
Principal amount				$ 35,100

[1] In April 2021, the Mann Group convertible note was amended. The interest rate prior to the amendment was 7.00% and the maturity date was in November 2024