Geographical Data - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Segment Reporting [Abstract]
Revenue attributable to individual foreign country	$ 0		$ 0
Long lived assets located in domestic markets	100.00%	100.00%