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Subsequent Events - Additional Information (Details) - USD ($) $ in Millions |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 08, 2018 | Oct. 31, 2018 | Sep. 30, 2018
Subsequent Event | JonesTrading Institutional Services LLC | At-the-Market (ATM) Sales Agreement |  |  |
Subsequent Event [Line Items] |  |  |
Common stock shares sold |  | 1,845,820 |
Net proceeds from sale of common stock |  | $ 16.4 |
2016 Equity Incentive Plan |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of outstanding share of common stock |  |  | 4.00%
2016 Equity Incentive Plan | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Increase in number of shares of common stock reserved for issuance | 1,759,602 |  |
Share based compensation plan expiration date | Aug. 07, 2028 |  |
Percentage of outstanding share of common stock | 4.00% |  |

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