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Summary of Significant Accounting Policies - Summary of reconciliation of shares used to determine net loss per share (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Summary of Significant Accounting Policies |  |  |  |
Net income (loss) | $ 11,277 | $ 2,386 | $ 10,201 | $ (499)
Weighted average number of shares - basic | 43,498,908 | 42,628,560 | 43,426,463 | 42,628,560
Shares underlying options | 2,919,899 | 289,002 | 2,418,082 |
Weighted average number of shares - diluted | 46,418,807 | 42,917,562 | 45,844,545 | 42,628,560

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