Commitments and Contingencies - Narrative (Details) $ in Thousands, ¥ in Millions						1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 05, 2018 patent	Jun. 26, 2018 USD ($)	Apr. 26, 2018 USD ($)	Apr. 26, 2018 CNY (¥)	Jun. 10, 2015 product subsidiary patent customer	Sep. 30, 2015 patent	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Apr. 26, 2018 CNY (¥)	Apr. 23, 2018 USD ($)	Apr. 23, 2018 CNY (¥)	Sep. 26, 2016 CNY (¥)
Contingencies [Line Items]
Gain on sale of Guangzhou factory | $							$ 0	$ 0	$ 0	$ 36,978
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 | Pending Litigation | Design Patents
Contingencies [Line Items]
Number of products named in lawsuit | product					1
Number of patents allegedly infringed upon | patent					2
UEBV Lawsuit | Pending Litigation | Utility Patents
Contingencies [Line Items]
Number of patents allegedly infringed upon | patent					1	1
Roku Lawsuit | Pending Litigation | Utility Patents
Contingencies [Line Items]
Number of patents allegedly infringed upon | patent	9
Guangzhou Factory | Disposed of by Sale
Contingencies [Line Items]
Consideration received in sale			$ 5,100								¥ 34	$ 51,400	¥ 339	¥ 320
Escrow deposit as percentage of purchase price														10.00%
Consideration receivable upon government approvals			35,800	¥ 237
Escrow deposit			$ 10,300	¥ 68
Gain on sale of Guangzhou factory | $		$ 37,000
Gain on sale of Guangzhou factory, net of income taxes | $		$ 32,100