Income Taxes - Changes in the Reserve for Income Taxes, Excluding Interest and Penalties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance of reserve for income taxes	$ 11,591	$ 7,294
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in prior periods		199
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in prior periods	162
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the current period	3,383	5,259
Gross amounts of decreases in unrecognized tax benefits as a result of the expiration of the applicable statutes of limitations	(1,184)	(1,161)
Balance of reserve for income taxes	$ 13,952	$ 11,591