Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Allowance For Doubtful Accounts (Detail)

v3.21.2
Summary of Significant Accounting Policies - Summary of Allowance For Doubtful Accounts (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]        
Balance at beginning of period $ 1,165 $ 1,104 $ 1,070 $ 1,038
Additions 226 101 604 498
Write – offs (248) (223) (312) (237)
Recoveries (180) (70) (399) (387)
Balance at end of year $ 963 $ 912 $ 963 $ 912