Geographical Data - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total Revenue	$ 3,856	$ 5,088	$ 7,936	$ 10,606
Domestic
Segment Reporting Information [Line Items]
Total Revenue	2,734	3,719	5,587	7,813
Foreign
Segment Reporting Information [Line Items]
Total Revenue	$ 1,122	$ 1,369	$ 2,349	$ 2,793