Restructuring and Exit Activities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 22
Charges	2
Settlements	(17)
Balance at end of period	7
Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	18
Charges	2
Settlements	(13)
Balance at end of period	7
Facility Costs And Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	4
Charges	0
Settlements	(4)
Balance at end of period	$ 0