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Warrants to Acquire Shares of Common Stock - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) | Jul. 16, 2018 $ / shares | May 31, 2018 $ / shares | Dec. 29, 2017 $ / shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Shares issued for cancellation of warrants (in shares) |  | 54,613 |  |  |  |
Surrender and cancellation of warrants (in shares) |  | 121,667 |  |  |  |
Common stock acquired in exchange for warrants (in shares) |  | 412,667 |  |  |  |
Fair value of consideration exchanged | $ |  | $ 1,200,000 |  |  |  |
Loss On Settlement Of Warrants Liability | $ |  | $ 727,000 | $ 0 |  |  |
Exercise price (usd per share) | $ / shares |  |  |  | $ 2.10 | $ 6.59 | $ 7.42
Galena February 2017 |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of warrant or right canceled |  | 534,334 |  |  |  |
Series A Convertible Preferred |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price (usd per share) | $ / shares |  | $ 6.59 |  |  |  |
Convertible Promissory Notes | Convertible Notes Payable |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ |  | $ 1,000,000.0 |  |  |  |
Common stock acquired in exchange for warrants (in shares) |  | 412,667 |  |  |  |
Warrants and rights outstanding | $ | $ 800,000 |  |  |  |  |
Conversion of units (in shares) | 118,644 |  |  |  |  |
Measurement Input, Price Volatility |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants and rights outstanding, measurement input |  |  |  |  |  | 0.9010
Measurement Input, Risk Free Interest Rate |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants and rights outstanding, measurement input |  | 0 |  |  |  | 0.0220
Measurement Input, Expected Dividend Rate |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants and rights outstanding, measurement input |  | 0 |  |  |  | 0

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