Quarterly report pursuant to Section 13 or 15(d)

Unaudited Interim Condensed Consolidated Statements of Cash Flows Supplemental Information - Additional Information (Detail)

v3.21.2
Unaudited Interim Condensed Consolidated Statements of Cash Flows Supplemental Information - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Condensed Cash Flow Statements, Captions [Line Items]    
Restricted cash $ 4,138 $ 495
Tranche Four Secured Notes [Member] | Funds Held In Escrow [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Restricted cash $ 4,100 $ 500