CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts	$ 32	$ 33
Preferred Stock par value	$ 0.001	$ 0.001
Preferred Stock shares authorized	5,000	5,000
Preferred Stock shares issued	0	0
Preferred Stock shares outstanding	0	0
Common stock par value	$ 0.001	$ 0.001
Common stock shares authorized	45,000	45,000
Common stock shares issued	19,634	19,451
Common stock shares outstanding	19,634	19,451