Annual report pursuant to Section 13 and 15(d)

Income Tax - Reconciliation of Unrecognized Tax Benefits of Uncertain Tax Positions (Detail)

v3.20.4
Income Tax - Reconciliation of Unrecognized Tax Benefits of Uncertain Tax Positions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits, Beginning Balance $ 724 $ 717 $ 715
Additions based on tax positions related to the current year 0 7 6
Deductions based on tax positions related to prior years 0 0 (4)
Additions based on tax positions related to the prior years 5 0 0
Additions based on tax positions related to prior period adjustments 38 0 0
Unrecognized tax benefits, Ending Balance $ 767 $ 724 $ 717