CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 299	$ 346
Debt instrument unamortized discount, current	375	0
Debt instrument unamortized discount , non-current	0	196
Unamortized debt issuance expense	$ 11	$ 448
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	11,788,000	11,365,000
Common stock, shares outstanding	11,078,000	10,747,000
Treasury stock, shares	710,000	618,000