Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands |
|
1 Months Ended |
12 Months Ended |
Jul. 20, 2018 |
Jul. 31, 2018 |
Feb. 28, 2018 |
Jun. 30, 2017 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Convertible Preferred Stock |
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| Proceeds from issuance of convertible preferred stock |
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$ 100,986
|
$ 120,067
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| Payments of initial public offering costs |
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$ 3,548
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| Preferred stock outstanding |
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0
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0
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| Series A redeemable convertible preferred stock |
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| Convertible Preferred Stock |
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| Percentage of cumulative dividends per year |
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8.00%
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| Convertible preferred stock redemption period |
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5 years
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| Maximum percentage of change in fair value of preferred stock |
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10.00%
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| Series B convertible preferred stock |
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| Convertible Preferred Stock |
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| Preferred stock issued |
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14,362,344
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| Convertible preferred stock issue price (dollars per share) |
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$ 8.39
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| Proceeds from issuance of convertible preferred stock |
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$ 120,500
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| Payments of initial public offering costs |
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$ 400
|
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| Series C convertible preferred stock |
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| Convertible Preferred Stock |
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| Preferred stock issued |
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7,912,432
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| Convertible preferred stock issue price (dollars per share) |
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$ 12.79
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| Proceeds from issuance of convertible preferred stock |
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$ 101,200
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| Payments of initial public offering costs |
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$ 200
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| Common stock |
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| Convertible Preferred Stock |
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| Number of common stock issued on conversion |
51,845,438
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51,845,438
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51,845,438
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