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v3.10.0.1

Formation and Business of the Company (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 | Dec. 31, 2017
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Net loss |  | $ (12,847) | $ (8,172) | $ (33,852) | $ (19,800) |
Net cash used in operating activities |  |  |  | (36,116) | $ (18,065) |
Cash, cash equivalents and investments |  | 152,700 |  | 152,700 |  |
Accumulated deficit |  | $ (93,042) |  | $ (93,042) |  | $ (59,191)
IPO |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Shares issued (shares) | 8,050,000 |  |  |  |  |
Proceeds from issuance initial public offering, net | $ 125,400 |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Shares issued (shares) | 1,050,000 |  |  |  |  |
Convertible Stock Converted into Shares of Common Stock |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Common shares issued upon conversion of convertible stock (shares) | 9,629,405 |  |  |  |  |

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