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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Federal statutory income tax rate (percent) |  | 21.00% | 35.00% | 28.00% |  |
Tax at federal statutory rate (benefit) | $ (2,500) |  |  | $ (13,061) | $ 909 | $ (11,209)
State income tax, net of federal benefit |  |  |  | 521 | 168 | 75
Change in valuation allowance |  |  |  | 25,302 | 3,246 | 9,465
Research and development credits |  |  |  | (7,311) | (1,355) | (1,364)
Foreign earnings taxed at other than U.S. rates |  |  |  | (1,065) | (492) | 1,678
Stock based compensation |  |  |  | (5,901) | (573) | 3,564
Goodwill amortization |  |  |  | 2,004 | 1,795 | 1,672
Nondeductible officer compensation |  |  |  | 1,927 | 470 | 77
Nondeductible meals and entertainment |  |  |  | 510 | 391 | 289
AMT credit monetization |  |  |  | (155) | (155) |
Deferred tax liability release - Tax reform |  |  |  | (2,482) |  |
Other |  |  |  | (144) | (64) | 89
Provision for income taxes |  |  |  | $ 145 | $ 4,340 | $ 4,336

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