Income Taxes - Income Tax Schedules (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
U.S. federal taxes:
Current		$ (1,673)	$ (57)	$ 55
Deferred		22	(510)	(1,943)
Non-U.S. taxes:
Current		1,940	1,765	2,898
Deferred		58	55	(298)
State taxes, net of federal benefit:
Current		1	3	(4)
Total provision for income taxes		$ 348	$ 1,256	$ 708
Effective income tax rate reconciliation
United States statutory rate	34.00%	21.00%	21.00%	28.10%
Stock-based compensation		0.00%	0.10%	(1.40%)
Foreign taxes, net		(36.10%)	(40.90%)	39.50%
Research and development credit		8.00%	11.70%	(17.10%)
Non-deductible expenses		(1.00%)	(2.70%)	7.00%
U.S. Tax Act deferred tax re-measurement		6.20%	0.00%	(44.00%)
Other		0.00%	1.40%	0.40%
Effective income tax rate		(1.90%)	(9.40%)	12.50%
Domestic and foreign components of income (loss) before taxes
U.S. operations		$ 3,549	$ 4,100	$ 4,219
Non-U.S. operations		(21,458)	(17,482)	1,437
Loss before income taxes		(17,909)	(13,382)	5,656
Deferred tax assets:
Accrued compensation		1,954	1,428
Net operating loss carryforwards		19,870	16,782
Depreciation		8,149	10,036
Tax credits		13,909	10,882
Operating lease liabilities		6,649	0
Capitalized intangible assets		10,367	11,981
Accruals and reserves		1,832	1,000
Total deferred tax assets		62,730	52,109
Valuation allowance		(37,827)	(35,420)
Total deferred tax assets, net of valuation allowance		24,903	16,689
Deferred tax liabilities:
Depreciation and amortization		(14,097)	(12,243)
Right of use assets		(6,453)	0
Accruals and reserves		(83)	(90)
Total deferred tax liabilities		(20,633)	(12,333)
Net deferred tax assets		4,270	4,356
Current and non-current deferred tax assets and liabilities
Long-term deferred tax assets		4,766	4,822
Long-term deferred tax liabilities		(496)	(466)
Net deferred tax assets		4,270	4,356
Unrecognized tax benefits rollforward
Balance at beginning of year	$ 6,589	7,150	7,143	6,589
Additions based on tax positions related to the current year		333	417	721
Reductions based on tax positions related to prior years		(114)	(271)	(11)
Reductions due to lapse of applicable statute of limitations		(243)	(139)	(156)
Balance at end of year		$ 7,126	$ 7,150	$ 7,143