Summary of Significant Accounting Policies - Narrative (Details) shares in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2019 USD ($) Segment shares	Dec. 31, 2018 USD ($) shares	Jul. 01, 2019 USD ($)	Jun. 30, 2019 USD ($)
Concentration Risk [Line Items]
Foreign currency transaction gain (loss), realized	$ 100,000	$ (100,000)	$ 12,000	$ (100,000)
Derivative instruments not designated as hedging instruments, gain (loss), net	(200,000)	(25,000)	(300,000)	(100,000)
Bad debt expenses	0	0	0	0
Inventory valuation reserves	200,000		$ 200,000			$ 200,000
Money back guarantee period			30 days
Returns liability reserve, net	300,000		$ 300,000			$ 400,000
Research and development	300,000	500,000	500,000	900,000
Income tax expense	$ (846,000)	$ (420,000)	$ 158,000	$ 166,000
Antidilutive securities excluded from EPS calculation (in shares) | shares	0.1	0.1	0.2	0.2
Number of operating segments | Segment			1
Number of geographic segments | Segment			2
Operating lease liabilities	$ 2,558,000		$ 2,558,000		$ 3,900,000
Right-of-use assets	$ 2,136,000		2,136,000		3,300,000
Cumulative effect of adoption of accounting principle					$ 508,000
Cash accounts held primarily at One Financial Institution
Concentration Risk [Line Items]
Concentration of credit risk			10,900,000
Cash held primarily at Other Financial Institutions
Concentration Risk [Line Items]
Concentration of credit risk			$ 3,600,000