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Fair Value Measurements (Valuation Techniques of Level 3 Liabilities) (Details) - Level 3
Mar. 31, 2019
yr
$ / shares
Dec. 31, 2018
yr
$ / shares
Interest rate reset | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Stock price (in dollars per share) | $ / shares $ 20.25 $ 14.43
Interest rate reset | Discounted cash flow | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.240 0.250
Interest rate reset | Discounted cash flow | Risk-free rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.022 0.025
Interest rate reset | Discounted cash flow | Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.371 0.439
Interest rate reset | Discounted cash flow | Term    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input | yr 2.79 3.04
Change of control redemption | Option pricing model | Risk-free rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.022 0.025
Change of control redemption | Option pricing model | Probability | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.00 0.00
Change of control redemption | Option pricing model | Probability | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.10 0.10