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Stockholders' Equity - Stock Warrant Activity During Period (Details) - Warrant [Member] - $ / shares |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019
Number of Warrants |  |
Outstanding and exercisable at January 1, 2018 |  | 1,214,815
Granted |  | 115,000
Expired/Forfeited |  | (750,000)
Outstanding and exercisable at December 31, 2018 | 1,214,815 | 579,815
Weighted Average Exercise Price |  |
Outstanding and exercisable at January 1, 2018 |  | $ 9.32
Granted |  | 3.17
Expired/Forfeited |  | 12.00
Outstanding and exercisable at December 31, 2018 | $ 9.32 | $ 4.63
Weighted Average Remaining Contractual Life (in Years), Outstanding and exercisable | 1 year 7 months 28 days | 2 years 3 months 26 days

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- Definition The number of grants made 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of warrants that were either forfeited or expired. + References No definition available. + Details
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- Definition The weighted average fair value of non vested awards on equity-based plans excluding option plans either forfeited or expired during the current period. + References No definition available. + Details
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- Definition The weighted average exercise price for warrants granted during the period. + References No definition available. + Details
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- Definition Number of share warrants outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Weighted Average Exercise Price [Roll Forward]. + References No definition available. + Details
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