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Income Taxes - Income Tax Schedules (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jul. 31, 2017
U.S. federal taxes:        
Current $ (57) $ 55 $ 1,043  
Deferred (510) (1,943) (325)  
Non-U.S. taxes:        
Current 1,765 2,898 (4,615)  
Deferred 55 (298) 7,548  
State taxes, net of federal benefit:        
Current 3 (4) 1  
Total provision for income taxes $ 1,256 $ 708 $ 3,652  
Effective income tax rate reconciliation        
United States statutory rate 21.00% 28.10% 34.00%  
Stock-based compensation 0.10% (1.40%) (0.40%)  
Foreign taxes, net (40.90%) 39.50% (0.70%)  
Research and development credit 11.70% (17.10%) (4.90%)  
Non-deductible expenses (2.70%) 7.00% 0.20%  
U.S. Tax Act deferred tax re-measurement 0.00% (44.00%) 0.00%  
Other 1.40% 0.40% 0.10%  
Effective income tax rate (9.40%) 12.50% 28.30%  
Domestic and foreign components of income (loss) before taxes        
U.S. operations $ 4,100 $ 4,219 $ 4,016  
Non-U.S. operations (17,482) 1,437 8,896  
Income before income taxes (13,382) 5,656 12,912  
Deferred tax assets:        
Accrued compensation 1,428 2,121    
Net operating loss carryforwards 16,782 7,213    
Depreciation 10,036 10,968    
Tax credits 10,882 8,380    
Capitalized intangible assets 11,981 12,942   $ 12,900
Capitalized Costs 0 2,292    
Accruals and reserves 1,000 1,197    
Total deferred tax assets 52,109 45,113    
Valuation allowance (35,420) (30,105)    
Total deferred tax assets, net of valuation allowance 16,689 15,008    
Deferred tax liabilities:        
Depreciation and amortization (12,243) (10,819)    
Accruals and reserves (90) (10)    
Total deferred tax liabilities (12,333) (10,829)    
Net deferred tax assets 4,356 4,179    
Current and non-current deferred tax assets and liabilities        
Long-term deferred tax assets 4,822 4,892    
Long-term deferred tax liabilities (466) (713)    
Net deferred tax assets 4,356 4,179    
Unrecognized tax benefits rollforward        
Balance at beginning of year 7,143 6,589 6,743  
Additions based on tax positions related to the current year 417 721 401  
Reductions based on tax positions related to prior years (271) (11) (4)  
Reductions due to lapse of applicable statute of limitations (139) (156) (551)  
Balance at end of year $ 7,150 $ 7,143 $ 6,589