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v3.19.3.a.u2

Nature of the Business (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 27, 2020 | Jan. 27, 2020 | Apr. 15, 2019 | Jun. 26, 2018 | Jun. 22, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Class of Stock |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  | $ 20,648 | $ 123,849 | $ 44,751 | $ 19,727 | $ 19,727
Accumulated deficit |  |  |  |  |  | 113,301 | 237,150 |  |  |
Cash |  |  |  |  |  | $ 217,450 | $ 210,643 | $ 246,984 | $ 137,070 |
Ordinary shares | Subsequent Events |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (shares) | 7,250,000 |  |  |  |  |  |  |  |  |
Per share price of issuance (usd per share) |  | $ 11.00 |  |  |  |  |  |  |  |
Ordinary shares | IPO |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (shares) |  |  |  | 10,147,059 | 10,147,059 |  |  |  |  |
Per share price of issuance (usd per share) |  |  |  | $ 17.00 | $ 17.00 |  |  |  |  |
Proceeds of issuance of ordinary shares, net of issuance costs |  |  |  |  | $ 156,500 |  |  |  |  |
Ordinary shares | Public Stock Offering |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (shares) |  |  | 4,830,000 |  |  |  |  |  |  |
Per share price of issuance (usd per share) |  |  | $ 24.00 |  |  |  |  |  |  |
Proceeds of issuance of ordinary shares, net of issuance costs |  |  | $ 108,800 |  |  |  |  |  |  |
Ordinary shares | Public Stock Offering | Subsequent Events |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (shares) |  | 7,250,000 |  |  |  |  |  |  |  |
Per share price of issuance (usd per share) |  | $ 11.00 |  |  |  |  |  |  |  |
Proceeds of issuance of ordinary shares, net of issuance costs |  | $ 75,000 |  |  |  |  |  |  |  |
Ordinary shares | Options |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (shares) |  |  | 630,000 |  | 1,323,529 |  |  |  |  |

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