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Description of Business - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 22, 2018 | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |  |
Date of incorporation |  | Mar. 13, 2014 |  |
Class A common stock, par value | $ / shares |  | $ 0.001 |  |
Reverse stock split | 1-for-5 |  |  |
Reverse stock split, conversion ratio | 5 |  |  |
Cash |  | $ 25,583 | $ 5,562 | $ 2,669
Net loss |  | 28,623 | 28,024 |
Accumulated deficit |  | $ 94,992 | $ 66,369 |

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