LEGAL PROCEEDINGS AND CONTINGENCIES (Details) $ in Millions																					1 Months Ended								12 Months Ended
	Nov. 15, 2018 USD ($)	Nov. 09, 2018 USD ($)	Sep. 22, 2017 patents	Dec. 27, 2016 patent	Dec. 12, 2016 patents	Nov. 01, 2016 patent	Aug. 11, 2016 patent	Apr. 01, 2016 patent	Oct. 21, 2015 patents	May 01, 2012 USD ($) patents	Feb. 03, 2011 USD ($)	May 05, 2010 patents	Dec. 18, 2009 patents	Nov. 04, 2009 patents patent	Dec. 22, 2008	Dec. 12, 2008 USD ($)	Nov. 07, 2008 patents	May 23, 2008 patents	Oct. 10, 2006 USD ($)	Oct. 20, 2004 patents	Nov. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 patent	Feb. 28, 2014 USD ($) patents patent	Dec. 31, 2012 patents	Apr. 30, 2012 patents	May 31, 2010 patents	Dec. 31, 2018 patents patent
Patent Inter Partes Review Petition Request One [Domain]
Gain and Loss Contingencies [Line Items]
Number of Patents in Inter Partes Review Petition Request																													11
Counterclaims [Member] | Patent Infringement Claim Three Counterclaim [Member]
Gain and Loss Contingencies [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number												2																1
Counterclaims [Member] | Patent Infringment Claim Five [Member]
Gain and Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party | $	$ 0.7
Loss Contingency, Damages Awarded, Value | $										$ 2.4
Gain Contingency, Patents Allegedly Infringed upon, Number										5
Judicial Ruling [Member] | Patent Infringement Claim Two [Member]
Gain and Loss Contingencies [Line Items]
Gain Contingency, Patents Found Infringed upon, Number																											2
Judicial Ruling [Member] | Patent Infringement Claim Two Counterclaim [Member]
Gain and Loss Contingencies [Line Items]
Loss Contingency, Patents Found Not Infringed, Number																											1
Number of Patents Found Invalid					1
Judicial Ruling [Member] | Patent Infringement Claim Four [Member]
Gain and Loss Contingencies [Line Items]
Loss Contingency, Patents Found Not Infringed, Number																										4
Judicial Ruling [Member] | Patent Infringment Claim Five [Member]
Gain and Loss Contingencies [Line Items]
Gain Contingency, Patents Found Infringed upon, Number | patent																								1
Judicial Ruling [Member] | Patent Inter Partes Review Petition Request One [Domain]
Gain and Loss Contingencies [Line Items]
Number of Patents Denied Inter Partes Review Proceedings			3
Number of Patents in Inter Partes Review Proceedings			8
Pending Litigation [Member] | Patent Infringement Claim One [Member]
Gain and Loss Contingencies [Line Items]
Period for petition for further stay of permanent injunction															90 days
Pending Litigation [Member] | Patent Infringement Claim Two [Member]
Gain and Loss Contingencies [Line Items]
Gain Contingency, Patents Allegedly Infringed upon, Number																		3
Pending Litigation [Member] | Patent Infringement Claim Two Counterclaim [Member]
Gain and Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party | $		$ 24.3
Number of patents withdrawn from infringement claims													1
Number of patents remaining in infringement claims					2								2														2
Percent of revenue impacted by patents involved in litigation																													0.50%
Loss Contingency, Patents Allegedly Infringed, Number																	3
Pending Litigation [Member] | Patent Infringement Claim Three Counterclaim [Member]
Gain and Loss Contingencies [Line Items]
Number of patents withdrawn from infringement claims												1
Pending Litigation [Member] | Patent Infringment Claim Five [Member]
Gain and Loss Contingencies [Line Items]
Number of patents withdrawn from infringement claims										1
Loss Contingency, Patents Allegedly Infringed, Number										4
Pending Litigation [Member] | Patent Infringment Claim Six [Member]
Gain and Loss Contingencies [Line Items]
Gain Contingency, Patents Found Infringed upon, Number									2
Pending Litigation [Member] | Patent Infringement Claim Seven [Member]
Gain and Loss Contingencies [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number | patent								1
Pending Litigation [Member] | Patent Infringement Claim Eight [Member]
Gain and Loss Contingencies [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number | patent							6
Pending Litigation [Member] | Patent Infringement Claim Nine [Member]
Gain and Loss Contingencies [Line Items]
Gain Contingency, Patents Allegedly Infringed upon, Number | patent						6
Loss Contingency, Patents Allegedly Infringed, Number | patent																													8
Pending Litigation [Member] | Patent Infringement Claim Ten [Member]
Gain and Loss Contingencies [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number | patent				6
Pending Litigation [Member] | Patent Infringement Claim Eleven [Member]
Gain and Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value | $																					$ 1.0
Positive Outcome of Litigation [Member] | Patent Infringement Claim One [Member]
Gain and Loss Contingencies [Line Items]
Gain Contingency, Patents Found Infringed upon, Number																				4
Litigation Settlement, Amount Awarded from Other Party | $											$ 12.9					$ 6.1			$ 34.0
Positive Outcome of Litigation [Member] | Patent Infringement Claim Three [Member]
Gain and Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party | $																						$ 146.5	$ 139.8		$ 105.0
Number of Patents in Infringement Case, Unenforceable | patent														1											1
Gain Contingency, Patents Allegedly Infringed upon, Number														2
Loss Contingency, Patents Allegedly Infringed, Number																									2