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Equity - December 2019 Financing (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 20, 2022 | Dec. 18, 2019 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |  |  |
Class of warrant or right, outstanding (in shares) |  |  | 692,523 | 1,040,813 | 1,040,932
Exercise price (in dollars per share) |  |  | $ 46.96 | $ 45.98 | $ 46.03
Issuance costs |  |  | $ 66 | $ 0 |
2019 Warrants |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Warrant issued | $ 800 |  |  |  |
December 2019 Financing |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 1,254,496 |  |  |
Share price (in dollars per share) |  | $ 43.80 |  |  |
Class of warrant or right, outstanding (in shares) |  | 766,275 |  |  |
Warrant issued |  | $ 40,700 |  |  |
Total aggregate purchase price |  | 65,600 |  |  |
Issuance costs |  | $ 4,400 |  |  |
Warrant liabilities, net of current portion |  |  | 3,800 |  |
Warrant, increase (decrease) in equity, amount |  |  | $ 2,600 | $ 12,700 |
December 2019 Financing | Common Warrant |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share price (in dollars per share) |  | $ 3.75 |  |  |
Exercise price (in dollars per share) |  | $ 43.80 |  |  |
Warrants and rights outstanding, term |  | 5 years |  |  |
December 2019 Financing | Pre-Funded Warrant |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Class of warrant or right, number of warrants exercised (in shares) |  | 278,070 |  |  |
Exercise price (in dollars per share) |  | $ 0.003 |  |  |

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