Net Loss per Share - Basic and Diluted Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income (loss) attributable to ION	$ (35,014)	$ (55,264)
Weighted average number of common shares outstanding (in shares)	10,600	10,971
Weighted average number of diluted common shares outstanding (in shares)	10,600	10,971
Basic net income (loss) per share (in dollars per share)	$ (3.30)	$ (5.04)
Diluted net income (loss) per share (in dollars per share)	$ (3.30)	$ (5.04)