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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 73 $ 93
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 172,647,588 161,526,044
Common stock, shares outstanding 172,647,588 161,526,044