Information About Geographic Areas - Product Revenue by Geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 104,446	$ 114,712	$ 116,456
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	52,637	55,404	59,674
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	29,739	36,772	33,045
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	18,478	16,967	19,810
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 3,592	$ 5,569	$ 3,927