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Commitments and Contingencies - Litigation (Details) $ in Millions				1 Months Ended	12 Months Ended	16 Months Ended
	Sep. 05, 2018 patent	Jan. 30, 2017 USD ($)	Jun. 10, 2015 product subsidiary patent customer	Sep. 30, 2015 patent	Dec. 31, 2016 USD ($)	Jun. 28, 2013 claim	Sep. 04, 2015 USD ($)
URC Lawsuit | Settled Litigation
Contingencies [Line Items]
Liability accrued					$ 6.6
Payment for settlement		$ 6.6
UEBV Lawsuit | Pending Litigation
Contingencies [Line Items]
Number of subsidiaries named in lawsuit | subsidiary			1
Number of customers named in lawsuit | customer			1
UEBV Lawsuit | Design Patents | Pending Litigation
Contingencies [Line Items]
Number of products named in lawsuit | product			1
Number of patents allegedly infringed upon | patent			2
UEBV Lawsuit | Utility Patent | Pending Litigation
Contingencies [Line Items]
Number of patents allegedly infringed upon | patent			1	1
Roku Lawsuit | Utility Patent | Pending Litigation
Contingencies [Line Items]
Number of patents allegedly infringed upon | patent	9
Operating Expense | URC Lawsuit | Settled Litigation
Contingencies [Line Items]
Lawsuits filed | claim						2
Estimated litigation costs					$ 2.0
Surety Bond
Contingencies [Line Items]
Restricted cash							$ 4.6

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