Fair Value Measurements (Summary of Valuation Techniques and Significant Unobservable Inputs Used) (Details) | 3 Months Ended | 12 Months Ended |
Mar. 31, 2021USD ($)Y | Dec. 31, 2020USD ($)Y |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | | |
Impairment losses on equipment | | $ 995,000 |
Lease and Off-Lease Equipment [Member] | | |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | | |
Impairment losses on equipment | $ 960,000 | 960,000 |
Level 3 Estimated Fair Value [Member] | Lease and Off-Lease Equipment [Member] | | |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | | |
Impairment losses on equipment | 960,000 | 960,000 |
Level 3 Estimated Fair Value [Member] | Nonrecurring [Member] | Lease and Off-Lease Equipment [Member] | Market Approach Valuation Technique [Member] | Unobservable Inputs, Third Party Agents' pricing Quotes - Per Equipment [Member] | | |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | | |
Impairment losses on equipment | $ 960,000 | $ 960,000 |
Level 3 Estimated Fair Value [Member] | Minimum [Member] | Recurring [Member] | Warrant [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 | 0.0005 | 0.0005 |
Level 3 Estimated Fair Value [Member] | Minimum [Member] | Recurring [Member] | Warrant [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 | 0.0010 | 0.0010 |
Level 3 Estimated Fair Value [Member] | Minimum [Member] | Recurring [Member] | Warrant [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 | 0.73 | 0.98 |
Level 3 Estimated Fair Value [Member] | Minimum [Member] | Recurring [Member] | Warrant [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 | 0.0008 | 0.0010 |
Level 3 Estimated Fair Value [Member] | Minimum [Member] | Recurring [Member] | Warrant [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 | 0.3429 | 0.3386 |
Level 3 Estimated Fair Value [Member] | Minimum [Member] | Nonrecurring [Member] | Lease and Off-Lease Equipment [Member] | Market Approach Valuation Technique [Member] | Unobservable Inputs, Third Party Agents' pricing Quotes - Per Equipment [Member] | | |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | | |
Impairment losses on equipment | $ 0 | $ 0 |
Level 3 Estimated Fair Value [Member] | Maximum [Member] | Recurring [Member] | Warrant [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 | 0.2705 | 0.2866 |
Level 3 Estimated Fair Value [Member] | Maximum [Member] | Recurring [Member] | Warrant [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 | 1.6005 | 1.6005 |
Level 3 Estimated Fair Value [Member] | Maximum [Member] | Recurring [Member] | Warrant [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 | 3.10 | 3.35 |
Level 3 Estimated Fair Value [Member] | Maximum [Member] | Recurring [Member] | Warrant [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 | 0.0049 | 0.0022 |
Level 3 Estimated Fair Value [Member] | Maximum [Member] | Recurring [Member] | Warrant [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 | 1.6395 | 1.5837 |
Level 3 Estimated Fair Value [Member] | Maximum [Member] | Nonrecurring [Member] | Lease and Off-Lease Equipment [Member] | Market Approach Valuation Technique [Member] | Unobservable Inputs, Third Party Agents' pricing Quotes - Per Equipment [Member] | | |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | | |
Impairment losses on equipment | $ 150,000 | $ 150,000 |
Level 3 Estimated Fair Value [Member] | Weighted Average [Member] | Recurring [Member] | Warrant [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 | 0.0023 | 0.0024 |
Level 3 Estimated Fair Value [Member] | Weighted Average [Member] | Recurring [Member] | Warrant [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 | 0.0032 | 0.0032 |
Level 3 Estimated Fair Value [Member] | Weighted Average [Member] | Recurring [Member] | Warrant [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 | 0.93 | 1.18 |
Level 3 Estimated Fair Value [Member] | Weighted Average [Member] | Recurring [Member] | Warrant [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 | 0.0011 | 0.0011 |
Level 3 Estimated Fair Value [Member] | Weighted Average [Member] | Recurring [Member] | Warrant [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 | 0.3582 | 0.3528 |