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Stockholders' Equity (Deficit) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 23, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense |  | $ 994 | $ 589 | $ 2,564 | $ 1,217 |
Research and development |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense |  | 475 | 322 | 1,217 | 676 |
General and administrative |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense |  | $ 519 | $ 267 | $ 1,347 | $ 541 |
2011 Stock Incentive Plan | Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Option expiration period |  |  |  | 10 years |  |
Option vesting period |  |  |  | 4 years |  |
2018 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available under the Plan (shares) |  |  |  |  |  | 3,000,000
Shares available for issuance under the Plan (shares) |  | 2,195,901 |  | 2,195,901 |  |
2018 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available under the Plan (shares) | 325,000 |  |  |  |  |
Purchase of common stock offer period under the plan | 6 months |  |  |  |  |
Discount rate from price of common stock on purchase date | 15.00% |  |  |  |  |
Commencement date to purchase common stock under the ESPP | Sep. 01, 2018 |  |  |  |  |

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