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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Consolidated Balance Sheets    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares outstanding 57,592,052 56,916,484
Treasury stock, shares 336,398 336,398