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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2018
Jun. 30, 2017
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 38,256,839 37,528,450
Common stock, outstanding shares 37,380,517 36,919,296
Treasury stock, shares 876,322 609,154