Segment and Geographic Information (Revenue By Geographic Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 274,329	$ 206,531	$ 230,807
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	229,131	169,244	185,829
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	27,931	23,217	27,929
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	16,077	13,118	15,976
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	1,190	952	1,073
Total international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 45,198	$ 37,287	$ 44,978