Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details)

v3.20.4
Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 11,330 $ 9,980 $ 9,422
Additions based on tax positions related to current year 1,357 1,362 1,087
Reductions to tax provision of prior years (4) (12) (529)
Balance at end of year $ 12,683 $ 11,330 $ 9,980