Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Summary of Quantitative Information Associated with Amounts Recognized in Unaudited Condensed Consolidated Financial Statements for Lease (Detail)

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Commitments and Contingencies - Summary of Quantitative Information Associated with Amounts Recognized in Unaudited Condensed Consolidated Financial Statements for Lease (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 01, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]            
Operating lease cost   $ 166 $ 166 $ 498 $ 498  
Variable lease cost   9 9 18 36  
Total operating lease expense   175 175 516 534  
Total lease payments $ 7,300 $ 116 $ 114 $ 343 $ 336  
Remaining Lease term (years)   7 years 10 months 2 days   7 years 10 months 2 days   8 years 7 months 2 days
Discount rate   15.00%   15.00%   15.00%