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Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 2,500 2,500
Preferred stock, shares issued 10 10
Preferred stock, shares outstanding 10 10
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 50,000 50,000
Common stock, shares issued 11,891 11,651
Common stock, shares outstanding 11,891 11,651