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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 219 $ 319
Common Stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 75,183,000 74,301,000
Common stock, shares outstanding (in shares) 75,183,000 74,301,000