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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 20,000 20,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 200,000 200,000
Common stock, shares issued 142,301 129,502
Common stock, shares outstanding 142,301 129,502