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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 59 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2020 | Jul. 31, 2017 | Jul. 01, 2017 | Jun. 30, 2017
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Decrease in deferred tax assets |  |  |  |  | $ 6,600,000 |  |  |  |  |  |  |
Increase in prepaid tax asset |  |  |  |  | $ 6,600,000 |  |  |  |  |  |  |
De-recognition of prepaid tax asset |  |  |  |  |  |  |  |  |  |  | $ 5,500,000 |
Deferred tax asset, certain China patent rights and certain manufacturing related IP |  |  |  |  |  |  |  |  |  | $ 12,900,000 |  |
Book value, certain China patent rights and certain manufacturing related IP |  |  |  |  |  |  |  |  |  | $ 0 |  |
Valuation allowance |  |  |  |  |  | $ 37,827,000 | $ 35,420,000 |  | $ 37,827,000 |  |  |
Valuation allowance increase |  |  |  |  |  | 2,400,000 | 5,300,000 |  |  |  |  |
Undistributed earnings of foreign subsidiaries |  |  |  |  |  | 159,400,000 |  |  | 159,400,000 |  |  |
Unrecognized tax benefits |  | $ 7,143,000 |  |  |  | 7,126,000 | 7,150,000 | $ 7,143,000 | 7,126,000 |  |  | $ 6,589,000
Unrecognized tax benefit, amount netted against deferred tax assets |  |  |  |  |  | 6,300,000 |  |  | 6,300,000 |  |  |
Unrecognized tax benefits that would reduce effective income tax rate |  |  |  |  |  | 4,300,000 |  |  | 4,300,000 |  |  |
Decrease in unrecognized tax benefits is reasonably possible |  |  |  |  |  | 100,000 |  |  | 100,000 |  |  |
Income tax interest and penalties accrued |  |  |  |  |  | 100,000 | 200,000 |  | 100,000 |  |  |
Income tax interest and penalties expense |  |  |  |  |  | $ 30,000.00 | $ 30,000.00 |  |  |  |  |
Tax Cuts and Jobs Act, change in tax rate, income tax benefit |  | 2,500,000 | $ 2,700,000 |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, measurement period adjustment, income tax expense (benefit) | $ (1,100,000) | $ 200,000 |  |  |  |  |  |  |  |  |  |
United States statutory rate |  |  |  | 34.00% |  | 21.00% | 21.00% | 28.10% |  |  |  |
Income tax benefit |  |  |  |  |  | $ 348,000 | $ 1,256,000 | $ 708,000 |  |  |  |
Long-term Income Tax Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  | 800,000 |  |  | 800,000 |  |  |
Federal [Member] |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 18,000,000.0 |  |  | 18,000,000.0 |  |  |
Research and development tax credit carryforwards |  |  |  |  |  | 8,300,000 |  |  | 8,300,000 |  |  |
State [Member] |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward |  |  |  |  |  | 7,100,000 |  |  | 7,100,000 |  |  |
Tax credit carryforward, subject to expiration |  |  |  |  |  | 600,000 |  |  | 600,000 |  |  |
Tax credit carryforward, not subject to expiration |  |  |  |  |  | 6,500,000 |  |  | 6,500,000 |  |  |
Net operating loss carryforwards |  |  |  |  |  | 800,000 |  |  | 800,000 |  |  |
Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 108,000,000.0 |  |  | 108,000,000.0 |  |  |
State research and development credit carryforward |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  | 5,400,000 | 5,100,000 |  | 5,400,000 |  |  |
Net operating loss, fixed asset and intangible asset | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  | $ 32,400,000 | $ 30,300,000 |  | 32,400,000 |  |  |
Altera Corp. v. Commissioner |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  | $ 0 |  |  |

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