Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts, accounts receivable $ 307 $ 101
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares outstanding 0 0
Common stock, shares authorized 50,000,000 50,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 27,065,376 26,936,021
Common stock, shares outstanding 27,065,376 26,936,021