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Subsequent Events - Initial Public Offering (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 29, 2019 | Sep. 30, 2018
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Subsequent Event [Line Items] |  |
Share price (in dollars per share) |  | $ 1.49
Subsequent Event | IPO |  |
Subsequent Event [Line Items] |  |
Number of shares issued and sold (in shares) | 6,700,000 |
Share price (in dollars per share) | $ 13.00 |
Net proceeds after deducting underwriters’ discounts, commissions, and offering costs | $ 77,700 |
Underwriters’ discounts and commissions | 5,900 |
Offering costs | $ 3,500 |
Shares of common stock converted from Series A and B convertible preferred stock (in shares) | 65,428,088 |
Conversion basis (in shares) | 1 |
Subsequent Event | IPO | Additional Paid in Capital |  |
Subsequent Event [Line Items] |  |
Reclassification of temporary equity to permanent equity | $ 106,200 |
Subsequent Event | IPO | Common Stock |  |
Subsequent Event [Line Items] |  |
Reclassification of temporary equity to permanent equity | $ 7 |
Subsequent Event | Selling Shareholders, Including Over-Allotment Option |  |
Subsequent Event [Line Items] |  |
Number of shares issued and sold (in shares) | 4,800,000 |
Subsequent Event | Over-Allotment Option |  |
Subsequent Event [Line Items] |  |
Number of shares issued and sold (in shares) | 1,500,000 |

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