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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2018
Jun. 30, 2018
CONSOLIDATED BALANCE SHEETS    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized shares 100,000,000 100,000,000
Common stock, issued shares 38,766,807 38,256,839
Common stock, outstanding shares 37,822,927 37,380,517
Treasury stock, shares 943,880 876,322