Geographical Data - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total Revenue	$ 3,481	$ 4,344	$ 11,417	$ 14,950
Domestic
Segment Reporting Information [Line Items]
Total Revenue	2,408	3,158	8,059	10,971
Foreign
Segment Reporting Information [Line Items]
Total Revenue	$ 1,073	$ 1,186	$ 3,358	$ 3,979