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Stockholders' Equity (Deficit) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 23, 2019 | Sep. 30, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | Jan. 31, 2019 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Shares authorized (in shares) | 200,000,000 | 200,000,000 | 1,970,000,000 | 1,675,200,000 | 1,675,200,000 | 1,470,000,000
Shares authorized (in shares) | 10,000,000 | 10,000,000 |  |  |  | 0
Common Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Stock issued upon conversion of redeemable convertible preferred shares (in shares) |  | 7,816,643 |  |  |  |
IPO | Common Stock |  |  |  |  |  |
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 issuance costs | $ 7,500 |  |  |  |  |
Stock issued upon conversion of redeemable convertible preferred shares (in shares) | 7,816,643 |  |  |  |  |
Over-Allotment Option | Common Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Number of shares issued in public offering | 540,000 |  |  |  |  |

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