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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]      
Statutory rate 27.60% 34.00% 34.00%
State income taxes, net (3.70%) (4.50%) (18.60%)
Impact of 2017 tax reform (107.00%) 0.00% 0.00%
Meals and entertainment (1.80%) (1.50%) 38.70%
Stock-based compensation 22.60% 0.00% 0.00%
AMT and research and development credits 22.40% (0.00%) (218.90%)
Other (2.00%) 0.20% 1.50%
Effective rate before valuation allowance (41.90%) 28.20% (163.30%)
Change in valuation allowance 38.70% (28.50%) 228.20%
Effective tax rate (3.20%) (0.30%) 64.90%