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PREFERRED STOCK - Preferred Stock Liquidation Preference (Details) - Series A Convertible Preferred Stock - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Class of Stock [Line Items]    
For shares outstanding at $10.00 per share $ 4,451 $ 4,451
Liquidation price (in USD per share) $ 10.00 $ 10.00
Cumulative unpaid dividends $ 15,660 $ 14,992
Preferred stock liquidation preference $ 20,111 $ 19,443