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Common Stock Warrants (Narrative) (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2014
Class of Warrant or Right [Line Items] |  |  |
Warrant, shares | 0 | 0 |
Series B Preferred Stock [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of preferred stock | 0 | 0 |
Common Stock [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants, issued | 1,152,125 |  |
Warrants, exercise period | 5 years |  |
Common Stock [Member] | Post-Reverse-Split Basis [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants, issued | 209,477 |  |
Exercise price of warrant | $ 10.18 |  |
Private Placement [Member] | Series B Preferred Stock [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of preferred stock |  |  | 480,000

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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