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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Accounts receivable, net of allowance for doubtful accounts $ 1,317 $ 638
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 39,300,000 37,503,000
Common stock, shares outstanding 39,300,000 37,503,000