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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 351 $ 471
Preferred stock, par value $ 0.000001 $ 0.000001
Preferred stock, shares authorized 25,000,000 25,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.000001 $ 0.000001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 61,053,000 60,662,000
Common stock, shares outstanding 61,053,000 60,662,000