Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands			3 Months Ended		6 Months Ended
	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2020 USD ($) region Segment shares	Dec. 31, 2019 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Concentration Risk [Line Items]
Foreign currency transaction gain (loss), realized			$ 300,000	$ 100,000	$ 400,000	$ 12,000
Derivative instruments not designated as hedging instruments, gain (loss), net			(200,000)	(200,000)	(400,000)	(300,000)
Bad debt expenses			0	0	0	0
Inventory valuation reserves	$ 300,000	$ 200,000	$ 300,000		$ 300,000
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	300,000	400,000	500,000
Present value of lease liabilities	17,458,000		17,458,000		17,458,000
Income tax expense			$ 1,761,000	$ (846,000)	$ 2,660,000	$ (158,000)
Antidilutive securities excluded from EPS calculation (in shares) | shares			45	100	100	200
Number of operating segments | Segment					1
Number of geographic segments | region					2
Beginning balance adjustment	35,516,000	33,254,000	$ 35,516,000	$ 29,098,000	$ 35,516,000	$ 29,098,000	$ 34,136,000	$ 29,624,000	$ 27,199,000
Revision of Prior Period, Accounting Standards Update, Adjustment
Concentration Risk [Line Items]
Beginning balance adjustment									$ 500,000
Sandy, UT
Concentration Risk [Line Items]
Salvage value	0		0		0
Abandonment expense					800,000
Present value of lease liabilities	200,000		$ 200,000		$ 200,000
Cash accounts held primarily at One Financial Institution
Concentration Risk [Line Items]
Concentration of credit risk	14,300,000	17,800,000
Cash held primarily at Other Financial Institutions
Concentration Risk [Line Items]
Concentration of credit risk	$ 5,400,000	$ 4,300,000