Nature of the Business and Basis of Presentation (Details) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jul. 20, 2018 |
Jul. 31, 2018 |
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Sale of Equity | ||||||||||||||
| Net proceeds after deducting underwriting discounts and commissions and other offering costs | $ 257,866 | |||||||||||||
| Net Loss | $ (40,539) | $ (40,852) | $ (37,854) | $ (48,486) | $ (44,472) | $ (47,015) | $ (39,390) | $ (32,581) | $ (167,731) | $ (163,458) | (89,195) | |||
| Accumulated deficit | (480,471) | $ (312,740) | (480,471) | $ (312,740) | $ (150,082) | $ (60,979) | ||||||||
| Current cash and investments | $ 176,300 | $ 176,300 | ||||||||||||
| Common stock | ||||||||||||||
| Sale of Equity | ||||||||||||||
| Shares issued (in shares) | 12,055,450 | |||||||||||||
| Conversion of redeemable convertible preferred stock to common stock (in shares) | 51,845,438 | 51,845,438 | 51,845,438 | |||||||||||
| IPO | ||||||||||||||
| Sale of Equity | ||||||||||||||
| Shares issued (in shares) | 12,055,450 | |||||||||||||
| Net proceeds after deducting underwriting discounts and commissions and other offering costs | $ 254,300 | |||||||||||||
| Overallotment | ||||||||||||||
| Sale of Equity | ||||||||||||||
| Shares issued (in shares) | 1,572,450 | |||||||||||||