Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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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 $ 199 $ 100
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 200,000,000 200,000,000
Common stock, issued (in shares) 100,294,098 100,190,126
Common Stock, Shares Outstanding ( in shares ) 100,294,098 100,190,126