Annual report pursuant to Section 13 and 15(d)

Summary of Unrecognized Tax Benefits (Detail)

v3.21.1
Summary of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Begining Balance $ 509 $ 509 $ 568
Additions for tax positions related to the prior year 0 0 0
Lapse of statute of limitations 0 0 (59)
Ending Balance $ 509 $ 509 $ 509