Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands		3 Months Ended
	Oct. 19, 2015	Sep. 30, 2016 USD ($) Segment shares	Sep. 30, 2015 USD ($) shares	Jun. 30, 2016 USD ($)
Summary Of Significant Accounting Policies
Foreign currency transaction gain (loss), realized		$ (100,000)	$ (200,000)
Derivative instruments, gain (loss) realized in income, net		(100,000)	(9,000)
Bad debt expenses		0	0
Inventory valuation reserves		$ 900,000		$ 400,000
Money back guarantee period		30 days
Percentage of products can be returned for a full refund by terminated distributors (up to)		30.00%
Percent of restocking fee		10.00%
Reserve for sales returns		$ 300,000		300,000
Research and development		300,000	200,000
Stock split conversion ratio	0.1429
Income tax expenses		$ 498,000	$ 640,000
Effective tax rate		29.70%
Statutory tax rate		35.00%
Antidilutive securities excluded from EPS calculation (in shares) | shares		46	500
Number of operating segments | Segment		1
Number of geographic segments | Segment		2
United States
Summary Of Significant Accounting Policies
Long-lived assets		$ 6,700,000		4,200,000
Japan
Summary Of Significant Accounting Policies
Long-lived assets		1,300,000		$ 1,300,000
Cash Accounts Held Primarily At One Financial Institution
Summary Of Significant Accounting Policies
Concentration of credit risk		6,200,000
Cash Accounts Held At Other Financial Institutions
Summary Of Significant Accounting Policies
Concentration of credit risk		$ 4,000,000