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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Federal statutory income tax rate (percent) | 35.00% | 21.00% | 28.00% |
Tax at federal statutory rate (benefit) |  | $ (5,433) | $ (13,061) | $ 909
State income tax, net of federal benefit |  | 517 | 521 | 168
Release of foreign valuation allowance |  | (2,794) |  |
Release of US valuation allowance – Tax reform |  | (4,680) |  |
Establishment of Irish valuation allowance |  | 8,642 |  |
US valuation allowance change – deferred tax movement |  | (4,444) | 25,302 | 3,246
Research and development credits |  | (6,598) | (7,311) | (1,355)
Foreign earnings taxed at other than U.S. rates |  | 10,562 | (1,065) | (492)
Stock based compensation |  | 2,436 | (5,901) | (573)
Goodwill amortization |  | 834 | 2,004 | 1,795
Nondeductible officer compensation |  | 713 | 1,927 | 470
Nondeductible meals and entertainment |  | 517 | 510 | 391
AMT credit monetization |  |  | (155) | (155)
Deferred tax liability release - Tax reform |  |  | (2,482) |
Other |  | (293) | (144) | (64)
Provision for income taxes |  | $ (21) | $ 145 | $ 4,340

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