Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail)

v3.20.4
Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Beginning balance $ 775 $ 1,246 $ 0
Prior periods 0 0 1,246
Current period 0 0 0
Settlement with tax authorities 0 0 0
Expiration of applicable statutes of limitation (720) (471) 0
Ending balance $ 55 $ 775 $ 1,246