Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Allowance for accounts receivable $ 1,090 $ 802
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 20,654,918 20,467,936
Common stock, shares outstanding 20,654,918 20,467,936