Restructuring Activities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 625,000	$ 0	$ 119,000
Restructuring charge	625,000	0	119,000
Restructuring charges, discontinued operations	0	$ 0	581,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charge			700,000
Restructuring charges, discontinued operations			$ 581,000
CHINA
Restructuring Cost and Reserve [Line Items]
Revenue remaining performance obligation, amount	0
CHINA | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charge	1,000
CHINA | Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 0