Fair Value Measurements (Summary of Valuation Techniques and Significant Unobservable Inputs Used) (Details) - Fair Value, Inputs, Level 3 [Member] - Recurring [Member] - Warrant [Member]	Sep. 30, 2019 Y $ / shares	Dec. 31, 2018 Y $ / shares
Market Approach [Member] | Unobservable Inputs, Stock Price [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.10
Minimum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Stock Price [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.24	0.18
Minimum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Exercise Price [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.02	0.02
Minimum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Time to Maturity (in Years) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values | Y	6.88	7.63
Minimum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Risk Free Interest Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.0162	0.0261
Minimum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Annualized Volatility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.3254	0.3420
Maximum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Stock Price [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	14.50	14.50
Maximum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Exercise Price [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	9.00	9.00
Maximum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Time to Maturity (in Years) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values | Y	12.20	12.95
Maximum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Risk Free Interest Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.0244	0.0274
Maximum [Member] | Black-Scholes Formulation [Member] | Unobservable Inputs, Annualized Volatility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	1.1448	2.9235