Revenue from Contracts with Customers - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 49,411	$ 52,114
North America
Disaggregation of Revenue [Line Items]
Net sales	25,984	31,009
International
Disaggregation of Revenue [Line Items]
Net sales	23,427	21,105
United States | North America
Disaggregation of Revenue [Line Items]
Net sales	24,337	28,624
Canada & Mexico | North America
Disaggregation of Revenue [Line Items]
Net sales	1,647	2,385
Brazil | International
Disaggregation of Revenue [Line Items]
Net sales	14,908	12,822
United Kingdom | International
Disaggregation of Revenue [Line Items]
Net sales	4,995	5,231
China | International
Disaggregation of Revenue [Line Items]
Net sales	1,581	1,514
Australia & New Zealand | International
Disaggregation of Revenue [Line Items]
Net sales	$ 1,943	$ 1,538