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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 |  |  |  |  |  |  |  |  |  |  |  |

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