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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Current taxes |  |  |  |  |
U.S. federal |  |  |  | $ 294 |
State and local |  | $ (92) | $ 90 | 364 |
Deferred taxes: |  |  |  |  |
U.S. federal |  | 403 | 5,449 | (15,167) |
State and local |  | 2,352 | (1,316) | (7,338) |
Total income tax expense (benefit) |  | 2,663 | 4,223 | (21,847) |
Tax Rate Reconciliation |  |  |  |  |
Pre-tax income |  | $ 67,118 | $ 58,046 | 16,751 |
Non-recurring tax benefit for valuation allowance reversal |  |  |  | 22,771 |
Non-recurring tax expense to revalue net deferred tax assets from Tax Cuts and Jobs Act |  |  |  | $ 8,626 |
Income tax expense (benefit) at statutory federal rate |  | 21.00% | 21.00% | 27.60% | 35.00%
Increase (reduction) in income taxes resulting from: |  |  |  |  |
Research and development credit and other credits |  | (3.20%) | (3.00%) | (6.60%) |
Non-deductible expenses |  | 1.60% | 1.30% | 4.60% |
Change in valuation allowance |  | 5.20% | 0.30% | (136.00%) |
Effect of Tax Cuts and Jobs Act |  |  |  | 51.50% |
Stock-based compensation expense |  | (18.30%) | (10.40%) | (58.30%) |
State and local income taxes, net of federal income tax benefit |  | (1.80%) | (2.00%) | (13.50%) |
Other |  | (0.50%) | 0.10% | 0.30% |
Total effective income tax rate |  | 4.00% | 7.30% | (130.40%) |
Deferred tax assets: |  |  |  |  |
Deferred rent |  |  | $ 1,963 |  |
Operating lease liability |  | $ 21,041 |  |  |
Accrued expenses |  | 9,915 | 4,344 |  |
Stock-based compensation |  | 13,351 | 10,373 |  |
Net operating loss carryforwards |  | 13,596 | 9,980 |  |
Federal and state tax credits |  | 16,714 | 11,977 |  |
Intangible assets |  |  | 385 |  |
Total deferred tax assets |  | 74,617 | 39,022 |  |
Valuation allowance |  | (3,967) | (502) |  |
Net deferred tax assets |  | 70,650 | 38,520 |  |
Deferred tax liabilities: |  |  |  |  |
Deferred contract costs |  | (41,229) | (27,116) |  |
Operating lease right-of-use assets |  | (12,607) |  |  |
Research and development costs |  | (8,563) | (6,294) |  |
Intangible assets |  | (781) |  |  |
Depreciation |  | (11,269) | (5,581) |  |
Total deferred tax liabilities |  | (74,449) | (38,991) |  |
Net deferred tax liability |  | (3,799) | $ (471) |  |
Effect of Tax Cuts and Jobs Act of 2017, Accounting Incomplete, Provisional |  |  |  |  |
Provisional amount of income tax expense attributable to a revaluation of deferred tax assets from change in tax rate | $ 0 |  |  |  |
State |  |  |  |  |
Deferred tax assets: |  |  |  |  |
Valuation allowance |  | $ (3,967) |  |  |

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