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Warrants - Issued and Outstanding (Details) - Common Stock - USD ($) $ / shares in Units, $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Oct. 16, 2018
--- | --- | --- | ---
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) |  |  | 160,657
Warrants Issued 3/1/2017 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) | 1,388 | 1,388 |
Price per Share (in dollars per share) | $ 5.94 | $ 5.94 |
Fair Value | $ 5 | $ 5 |
Warrants Issued 7/19/2013 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) | 32,983 | 32,983 |
Price per Share (in dollars per share) | $ 9.1 | $ 9.1 |
Fair Value | $ 122 | $ 122 |
Warrants Issued 11/26/2014 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) | 6,680 | 6,680 |
Price per Share (in dollars per share) | $ 16.47 | $ 16.47 |
Fair Value | $ 49 | $ 49 |
Warrants Issued 10/20/2015 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) | 41,650 | 41,650 |
Price per Share (in dollars per share) | $ 16.47 | $ 16.47 |
Fair Value | $ 396 | $ 396 |
Warrants Issued 11/9/2015 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) | 25,709 | 25,709 |
Price per Share (in dollars per share) | $ 16.47 | $ 16.47 |
Fair Value | $ 244 | $ 244 |
Warrants Issued 12/22/2016 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) | 9,712 | 9,712 |
Price per Share (in dollars per share) | $ 10.03 | $ 10.03 |
Fair Value | $ 45 | $ 45 |
Common Stock Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of Shares Underlying Warrants (in shares) | 118,122 | 118,122 |
Fair Value | $ 861 | $ 861 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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