CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 131	$ 143
Common stock, par value (in dollars per share)	$ 0.00025	$ 0.00025
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	12,770,796	12,621,781
Common stock, shares outstanding	12,770,796	12,621,781