Litigation, Claims, and Assessments - Additional Information (Details) - Patent Infringement $ in Millions	Mar. 23, 2016 patent	Mar. 11, 2016 inter_parts_review	Feb. 26, 2016 patent inter_parts_review	Jan. 14, 2016 patent inter_parts_review	Dec. 17, 2015 patent	Dec. 10, 2015 patent	Sep. 10, 2015 inter_parts_review	Aug. 20, 2015 inter_parts_review	Aug. 04, 2015 USD ($)
Blue Coat Systems, Inc.
Loss Contingencies [Line Items]
Damages awarded | $									$ 39.5
Number of patents asserted					7
Number of IPR's					5
Symantec Corp [Member]
Loss Contingencies [Line Items]
Number of IPR's | inter_parts_review							11	8
Symantec Corp [Member] | Denied | Subsequent Event
Loss Contingencies [Line Items]
Number of patents asserted	10		8	5
Number of IPR's | inter_parts_review		2	2	6
Palo Alto Networks, Inc.
Loss Contingencies [Line Items]
Number of patents asserted						10