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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Restricted cash $ 200 $ 200
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 90,000,000 90,000,000
Common stock, shares issued 22,656,183 20,623,129
Common stock, shares outstanding 22,656,183 20,623,129