CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 315	$ 307
Debt instrument unamortized discount and debt issuance costs, current	319	180
Debt instrument unamortized discount and debt issuance costs, non-current	$ 2,032	$ 221
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	11,879,000	11,836,000
Common stock, shares outstanding	11,160,000	11,109,000
Treasury stock, shares	743,000	727,000