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Preferred and Common Stock Warrants - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 03, 2018 | May 31, 2018 | Jun. 30, 2017
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Common stock warrant exercisable conversion | 10.00% |  |  |  |  |
Revaluation of warrant expense | $ 226 | $ 0 | $ 0 |  |  |
Other Liabilities, Noncurrent |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair value of redeemable convertible preferred stock liability |  | $ 1,100 | $ 1,100 | $ 7,200 |  |
Redeemable Convertible Preferred Stock Warrants, One | Series A-1 |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  | $ 3.13
Redeemable Convertible Preferred Stock Warrants, One | Series A-1 | Maximum |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued upon exercisable of warrants |  |  |  |  |  | 26,000
Redeemable Convertible Preferred Stock Warrants, One | Series A-2 | Maximum |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued upon exercisable of warrants |  |  |  |  |  | 57,181
Redeemable Convertible Preferred Stock Warrants | Series A-1 |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ 3.13 |  |  |  |  |
Redeemable Convertible Preferred Stock Warrants | Series A-1 | Maximum |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued upon exercisable of warrants | 124,506 |  |  |  |  |
Redeemable Convertible Preferred Stock Warrants | Series A-2 | Maximum |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued upon exercisable of warrants | 273,825 |  |  |  |  |
Common Stock Warrant |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ 0.06 |  |  |  |  |
Shares issued upon exercise of warrants |  |  |  |  | 45,286 |
Common Stock Warrant | Tides Foundation |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued upon exercisable of warrants |  |  |  |  | 500,000 |
Exercise price of warrants (in dollars per share) |  |  |  |  | $ 0.01 |
Common Stock Warrant | Maximum |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued upon exercisable of warrants | 45,286 |  |  |  |  |

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