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Performance-Based Common Stock Warrants - Assumptions Used in Valuation and Weighted Average Fair Value of Warrants (Details) - Common Stock Purchase Warrants
Mar. 31, 2019
$ / shares
Mar. 31, 2018
$ / shares
Class of Warrant or Right [Line Items]    
Fair value (in dollars per share) $ 9.00 $ 16.88
Price of Universal Electronics Inc. common stock (in dollars per share) $ 37.46 $ 52.43
Risk-free interest rate    
Class of Warrant or Right [Line Items]    
Valuation assumption rate 0.0222 0.0254
Expected volatility    
Class of Warrant or Right [Line Items]    
Valuation assumption rate 0.4445 0.3453
Expected life    
Class of Warrant or Right [Line Items]    
Expected life 3 years 9 months 4 years 9 months