Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands			3 Months Ended		9 Months Ended
	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2021 USD ($) Segment region shares	Mar. 31, 2020 USD ($) shares	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Concentration Risk [Line Items]
Foreign currency transaction gain (loss), realized			$ (300,000)	$ (500,000)	$ 200,000	$ (500,000)
Derivative instruments not designated as hedging instruments, gain (loss), net			(26,000)	100,000	(400,000)	(200,000)
Bad debt expenses			0	0	0	0
Inventory valuation reserves	$ 400,000	$ 200,000	$ 400,000		$ 400,000
Money back guarantee period					30 days
Handling and restocking fee, percentage	10.00%		10.00%		10.00%
Return liability reserve	$ 200,000	300,000	$ 200,000		$ 200,000
Research and development			200,000	200,000	600,000	800,000
Present value of lease liabilities	17,834,000		17,834,000		17,834,000
Income tax expense			$ 107,000	$ 1,005,000	$ 2,768,000	$ 848,000
Antidilutive securities excluded from EPS calculation (in shares) | shares			50	9	100	100
Number of operating segments | Segment					1
Number of geographic segments | region					2
Beginning balance adjustment	35,628,000	33,254,000	$ 35,628,000	$ 28,598,000	$ 35,628,000	$ 28,598,000	$ 35,516,000	$ 34,136,000	$ 29,098,000	$ 29,624,000	$ 27,199,000
Cumulative Effect, Period of Adoption, Adjustment
Concentration Risk [Line Items]
Beginning balance adjustment											$ 508,000
Sandy, UT
Concentration Risk [Line Items]
Salvage value	0		0		0
Abandonment expense					800,000
Present value of lease liabilities	0		$ 0		$ 0
Cash accounts held primarily at One Financial Institution
Concentration Risk [Line Items]
Concentration of credit risk	13,800,000	17,800,000
Cash held primarily at Other Financial Institutions
Concentration Risk [Line Items]
Concentration of credit risk	$ 5,100,000	$ 4,300,000