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Description of Business - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |  |
Net loss | $ 7,519 | $ 5,959 | $ 7,894 | $ 8,880 | $ 6,658 | $ (7,185) | $ 21,371 | $ 8,353 | $ 19,222 | $ 45,117
Net cash used in operating activities |  |  |  |  |  |  | $ 18,322 | $ 12,894 | $ 14,732 | $ 15,398

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