Restructuring (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,600	$ 346	$ 0
Restructuring Reserve	1,000	700
Restructuring costs charged as period expense		300
Remaining expected restructuring costs		2,000
Carrying value of building	$ 37,090	37,156
Vacated Facility at Mt. Airy, North Carolina
Restructuring Cost and Reserve [Line Items]
Carrying value of building		$ 2,000