Litigation, Claims and Assessments - (Details)	Sep. 21, 2016 USD ($)	Jul. 26, 2016 patent	Mar. 29, 2016 inter_parts_review	Mar. 11, 2016 patent inter_parts_review	Feb. 26, 2016 patent inter_parts_review	Jan. 14, 2016 patent inter_parts_review	Dec. 15, 2015 patent	Dec. 10, 2015 patent	Sep. 10, 2015 inter_parts_review	Aug. 20, 2015 inter_parts_review	Aug. 04, 2015 USD ($)	Sep. 07, 2016 USD ($)	Jun. 10, 2016 petition	May 26, 2016 petition	Apr. 29, 2016 petition	Apr. 27, 2016 petition	Mar. 01, 2016 patent	Jan. 19, 2016 petition	Nov. 06, 2015 petition	Nov. 05, 2015 petition	Sep. 11, 2015 petition	Jul. 03, 2015 petition
Loss Contingencies [Line Items]
Number of asserted patents, Ex Parte Reexamination							2
Number of patents, newly issued																	2
Finjan, Inc. v. Blue Coat Systems, Inc
Loss Contingencies [Line Items]
Damages awarded | $											$ 39,500,000
Finjan, Inc. v. Sophos Inc
Loss Contingencies [Line Items]
Damages awarded | $	$ 15,000,000
Finjan, Inc. v. Blue Coat Systems LLC
Loss Contingencies [Line Items]
Number of inter parts review							5
Number of patents asserted							7
Finjan, Inc. v. Symantec Corp
Loss Contingencies [Line Items]
Number of inter parts review | inter_parts_review									11	8
Finjan, Inc. v. Symantec Corp | Denied
Loss Contingencies [Line Items]
Number of inter parts review | inter_parts_review				2	2	6
Number of patents asserted				10	8	5
Finjan, Inc. v. Palo Alto Networks, Inc
Loss Contingencies [Line Items]
Number of patents asserted								10
Finjan, Inc. v. ESET, LLC
Loss Contingencies [Line Items]
Number of patents asserted		6
Number of patents first-to-file		5
Palo Alto Networks, Inc
Loss Contingencies [Line Items]
Number of inter parts review | inter_parts_review			2
Number of petitions filed for inter partes review | petition																			2	2
Blue Coat Systems, Inc
Loss Contingencies [Line Items]
Number of petitions filed for inter partes review | petition													2			2		2
Blue Coat Systems, Inc | Finjan, Inc. v. Blue Coat Systems, Inc
Loss Contingencies [Line Items]
Bond amount | $												$ 40,086,172.78
Symantec Corp
Loss Contingencies [Line Items]
Number of petitions filed for inter partes review | petition														3							2	2
Proofpoint and Armorize Technologies
Loss Contingencies [Line Items]
Number of petitions filed for inter partes review | petition															2