Fair Value Measurements (Summary of Valuation Techniques and Significant Unobservable Inputs Used) (Details) - Fair Value, Inputs, Level 3 [Member] - Recurring [Member] - Warrant [Member] - Black-Scholes formulation [Member]	Dec. 31, 2019 $ / shares USD ($)	Dec. 31, 2018 $ / shares USD ($)
Minimum [Member] | Unobservable Inputs, Stock Price [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values | $ / shares	0.24	0.18
Minimum [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] | Unobservable Inputs, Time to Maturity (in Years) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	6.63	7.63
Minimum [Member] | Unobservable Inputs, Risk Free Interest Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.0180	0.0261
Minimum [Member] | Unobservable Inputs, Annualized Volatility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.3221	0.3420
Maximum [Member] | Unobservable Inputs, Stock Price [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values | $ / shares	16.07	14.50
Maximum [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] | Unobservable Inputs, Time to Maturity (in Years) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	11.95	12.95
Maximum [Member] | Unobservable Inputs, Risk Free Interest Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	0.0199	0.0274
Maximum [Member] | Unobservable Inputs, Annualized Volatility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants, Range of Input Values	1.1144	2.9235