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 6 Months Ended
Mar. 01, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]            
Operating lease cost   $ 166 $ 166 $ 332 $ 332  
Variable lease cost   10 6 9 27  
Total operating lease expense   176 172 341 359  
Total lease payments $ 7,300 $ 57 $ 56 $ 227 $ 223  
Remaining Lease term (years)   8 years 1 month 2 days   8 years 1 month 2 days   8 years 7 months 2 days
Discount rate   15.00%   15.00%   15.00%