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Common Stock Warrants (Details) - $ / shares | Jun. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | May 31, 2018 | Feb. 29, 2016 | Feb. 28, 2015
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Warrants |  |  |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) | 19,426 | 28,489 |  |  |  |
Common stock warrant, Exercise price $66.20 per share, Issued February 2015 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  | $ 66.20
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  |  |  | 9,063
Common stock warrant, Exercise Price $15.40 per share, Issued February 2016 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  | $ 15.40 |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  |  | 8,249 |
Common stock warrant, Exercise price $23.69 per share, Issued May 2018 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 23.69 |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  | 6,332 |  |
Common stock warrant, Exercise price $14.71 per share, Issued March 2019 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  | $ 14.71 |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  | 4,845 |  |  |

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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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