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Performance-Based Common Stock Warrants - Assumptions Used in Valuation and Weighted Average Fair Value of Warrants (Details) - Performance-based warrants | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares
--- | --- | ---
Class of Warrant or Right [Line Items] |  |
Fair value (in dollars per share) | $ 3.45 | $ 19.49
Price of Universal Electronics Inc. common stock (in dollars per share) | $ 24.81 | $ 55.61
Risk free interest rate |  |
Class of Warrant or Right [Line Items] |  |
Risk-free interest rate | 0.0249 | 0.0206
Expected life in years | 4 years | 5 years 2 months 1 day
Expected price volatility |  |
Class of Warrant or Right [Line Items] |  |
Risk-free interest rate | 0.4316 | 0.3430

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