Goodwill - Changes in Goodwill by Reporting Units (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning		$ 49,704,000	$ 67,274,000
Recognized goodwill		5,467,000	4,443,000
Impairment of goodwill	$ (21,200,000)	0	(21,233,000)	$ 0
Foreign currency translation		2,370,000	(780,000)
Goodwill, ending	$ 49,704,000	$ 57,541,000	$ 49,704,000	$ 67,274,000