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Summary of Significant Accounting Policies - Narrative (Details)
shares in Thousands
 3 Months Ended 6 Months Ended
Oct. 19, 2015
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2016
USD ($)
Segment
shares
Dec. 31, 2015
USD ($)
shares
Jun. 30, 2016
USD ($)
Summary Of Significant Accounting Policies            
Foreign currency transaction gain (loss), realized   $ (300,000) $ (4,000) $ (400,000) $ (200,000)  
Derivative instruments, gain (loss) realized in income, net   200,000 2,000 100,000 (7,000)  
Bad debt expenses       0 0  
Inventory valuation reserves   $ 600,000   $ 600,000   $ 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%   30.00%    
Percent of restocking fee   10.00%   10.00%    
Reserve for sales returns   $ 400,000   $ 400,000   300,000
Research and development       600,000 500,000  
Stock split conversion ratio 0.1429          
Income tax expenses   $ 129,000 $ 819,000 $ 627,000 $ 1,459,000  
Effective tax rate       30.00%    
Statutory tax rate       35.00%    
Antidilutive securities excluded from EPS calculation (in shares) | shares   100 200 43 200  
Number of operating segments | Segment       1    
Number of geographic segments | Segment       2    
United States            
Summary Of Significant Accounting Policies            
Long-lived assets   $ 6,600,000   $ 6,600,000   4,200,000
Japan            
Summary Of Significant Accounting Policies            
Long-lived assets   $ 1,000,000   1,000,000   $ 1,300,000
Cash Accounts Held Primarily At One Financial Institution            
Summary Of Significant Accounting Policies            
Concentration of credit risk       8,400,000    
Cash Accounts Held At Other Financial Institutions            
Summary Of Significant Accounting Policies            
Concentration of credit risk       $ 3,300,000