Information about Geographic Areas - Schedule of 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
Information about geographic areas
Revenue	$ 8,089	$ 11,729	$ 18,033	$ 26,247
United States
Information about geographic areas
Revenue	2,537	4,873	7,109	13,360
Japan
Information about geographic areas
Revenue				313
Asia-Pacific ex Japan
Information about geographic areas
Revenue	5,451	6,286	10,823	11,973
Europe and Middle East
Information about geographic areas
Revenue	$ 101	$ 570	$ 101	$ 601