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Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Sep. 30, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Preferred stock, par value $ 0.0025 $ 0.0025
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.0025 $ 0.0025
Common stock, shares authorized 100,000 100,000
Common stock, shares issued 42,315 40,986
Common stock, shares outstanding 42,315 40,986