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Warrants to Purchase Common or Preferred Stock - Outstanding warrants (Details) | Sep. 30, 2019 $ / shares shares
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Class of Warrant or Right [Line Items] |
Common stock warrants, shares | 461,273
Warrant expiration January 19, 2026 |
Class of Warrant or Right [Line Items] |
Common stock warrants, shares | 282,402
Exercise Price | $ / shares | $ 1.84
Warrant expiration March 31, 2026 |
Class of Warrant or Right [Line Items] |
Common stock warrants, shares | 74,018
Exercise Price | $ / shares | $ 1.84
Warrant expiration April 1, 2026 |
Class of Warrant or Right [Line Items] |
Common stock warrants, shares | 131
Exercise Price | $ / shares | $ 1.84
Warrant expiration September 8, 2024 |
Class of Warrant or Right [Line Items] |
Common stock warrants, shares | 83,778
Exercise Price | $ / shares | $ 14.32
Warrant expiration December 7, 2025 |
Class of Warrant or Right [Line Items] |
Common stock warrants, shares | 20,944
Exercise Price | $ / shares | $ 14.32

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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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