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Stockholders' Equity - Issuances of Warrants (Details) | May 22, 2020 shares | Jul. 29, 2019 | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 shares
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Class of Stock [Line Items] |  |  |  |
Reverse stock split, conversion ratio |  | 0.125 |  |
No. of Warrants (in shares) |  |  | 62,500 |
Warrants expired unexercised (in shares) | 40,625 |  |  |
Warrant, November 13, 2022 Expiration |  |  |  |
Class of Stock [Line Items] |  |  |  |
No. of Warrants (in shares) |  |  | 62,500 | 103,125
Exercise Price (usd per share) | $ / shares |  |  | $ 18.08 |

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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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