CONDENSED CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Trade accounts receivable, allowance for doubtful accounts (in dollars)	$ 1,945	$ 2,135
Preferred stock, par value (in dollars per share)	$ 0.000001	$ 0.000001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.000001	$ 0.000001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	13,077,468	1,514,899
Common Stock, shares outstanding	13,077,468	1,514,899