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Convertible Preferred Stock and Preferred Stock Warrants - Preferred stock warrants (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 19, 2016 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Class of Warrant or Right [Line Items] |  |  |  |
Term of the Consulting Agreement | 12 months |  |  |
Monthly retainer amount | $ 50 |  |  |
Preferred stock warrant liability | $ 600 |  |  |
Fair Value Adjustment of Warrants |  | $ 200 | $ 0 | $ 200
Series A Preferred stock |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Number of shares called by warrants issued in lieu of monthly retainer | 147,201 |  |  |
Exercise price of warrants (in dollars per share) | $ 0.01 |  |  |
Shares issued upon exercise of warrants |  | 73,601 |  |
From the date of issuance | Series A Preferred stock |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Term of warrants | 10 years |  |  |
After the closing of a firm commitment underwritten initial public offering | Series A Preferred stock |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Term of warrants | 3 years |  |  |

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