Stockholders' Equity - Warrants (Details) - Warrants (Note 6) [Member] - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Warrants, Outstanding Beginning Balance | 4,207,447 | 4,280,972 | |
| Warrants, Exercised | (102,742) | (73,525) | |
| Warrants, Expired | (4,047,190) | ||
| Warrants, Outstanding Ending Balance | 57,515 | 4,207,447 | 4,280,972 |
| Weighted Average Exercise Price, Nonvested Beginning Balance | $ 6.81 | $ 6.69 | |
| Weighted Average Exercise Price Exercised | 0.13 | 0 | |
| Weighted Average Exercise Price Expired | 7.00 | ||
| Weighted Average Exercise Price, Nonvested Ending Balance | $ 5.39 | $ 6.81 | $ 6.69 |
| Weighted Average Remaining Contractual Life, Outstanding (in years) | 1 year 2 months 19 days | 1 year 3 months | 2 years 3 months 29 days |
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- Definition The weighted average fair value at grant date for nonvested equity-based awards expired during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). No definition available.
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- Definition Number of warrants or rights outstanding. No definition available.
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 Number of non-option equity instruments exercised by participants. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares under non-option equity instrument agreements for which rights to exercise lapsed. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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