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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 31, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Class Of Stock [Line Items] |  |  |  |  |
Ordinary shares, shares authorized | 100,000,000 |  |  | 100,000,000 |
Ordinary shares, issued | 21,026,184 |  |  | 22,071,432 |
Ordinary shares, outstanding | 21,026,184 |  |  | 22,071,432 |
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs |  |  |  | $ 15,777 | $ 161,447
Issuance of ordinary shares, net of issuance expenses |  |  |  | $ 15,853 | $ 161,662
Cowen and Company Limited Liability Company | ATM Sales Agreement |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of ordinary shares, shares |  |  | 700,000 |  |
Issuance of ordinary shares, net of issuance expenses |  |  | $ 16,600 |  |
Net proceeds from issuance ordinary shares after deducting sales commissions |  |  | 15,800 |  |
Issuance of ordinary shares, value, remaining capacity |  |  | $ 83,400 |  |
Cowen and Company Limited Liability Company | Maximum | ATM Sales Agreement |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs | $ 100,000 |  |  |  |
Underwritten Public Offering |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of ordinary shares, shares |  | 4,207,317 |  |  |
Additional ordinary shares exercised under underwriters option to purchase at the public offering price |  | 548,780 |  |  |
Issuance of ordinary shares, price per share |  | $ 41.00 |  |  |
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs |  | $ 161,400 |  |  |

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