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

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