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Organization - (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 23, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |
Cash and cash equivalents |  | $ 77,828 | $ 13,164
Accumulated deficit |  | $ 161,194 | $ 152,564
Common Stock |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Stock issued upon conversion of redeemable convertible preferred shares (in shares) |  | 7,816,643 |
Common Stock | IPO |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares issued in public offering | 4,140,000 |  |
Shares issued in public offering, price per share (in dollars per share) | $ 14.00 |  |
Proceeds from public offering, net | $ 50,500 |  |
Stock issued upon conversion of redeemable convertible preferred shares (in shares) | 7,816,643 |  |
Common Stock | Over-Allotment Option |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares issued in public offering | 540,000 |  |

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