Goodwill - Changes in Goodwill by Reporting Units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning	$ 67,274,000	$ 52,750,000
Recognized goodwill	4,443,000	16,423,000
Impairment of goodwill	(21,233,000)	0	$ 0
Foreign currency translation	(780,000)	(1,899,000)
Goodwill, ending	$ 49,704,000	$ 67,274,000	$ 52,750,000