Fair Value Measurements (Reconciliation Of Changes In The Fair Value Of Liabilities) (Details) - Warrant Liabilities [Member] - USD ($) |
6 Months Ended | 12 Months Ended | |
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Jun. 30, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |||
| Balance | $ 41,717 | $ 2,307,586 | $ 7,853,635 |
| Unrealized losses, net | 227,094 | (2,265,869) | (5,546,049) |
| Balance | $ 268,811 | $ 41,717 | $ 2,307,586 |
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Unrealized (Gains) Losses No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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