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Selected Unaudited Quarterly Financial Data - Summary of Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 9,487 | $ 64,530 | $ 1,750 | $ 1,750 | $ 9,750 | $ 1,750 | $ 1,750 | $ 1,750 |  |  |
Total operating expenses | 61,499 | 62,978 | 47,125 | 30,150 | 27,277 | 24,999 | 30,910 | 20,523 | $ 201,752 | $ 103,709 | $ 63,212
Net income (loss) | $ (51,853) | $ 1,822 | $ (45,074) | $ (27,753) | $ (16,598) | $ (22,352) | $ (28,090) | $ (17,670) | $ (122,858) | $ (84,710) | $ (49,594)
Net income (loss) per share — basic | $ (0.82) | $ 0.03 | $ (0.93) | $ (0.63) |  |  |  |  |  |  |
Net income (loss) per share — diluted | $ (0.82) | $ 0.03 | $ (0.93) | $ (0.63) |  |  |  |  |  |  |
Weighted average number of shares, basic | 63,527,932 | 62,599,193 | 48,556,843 | 44,282,607 |  |  |  |  |  |  |
Weighted average number of shares, diluted | 63,527,932 | 65,145,707 | 48,556,843 | 44,282,607 |  |  |  |  |  |  |
Net loss per share — basic and diluted |  |  |  |  | $ (0.38) | $ (0.51) | $ (0.64) | $ (0.41) | $ (2.24) | $ (1.93) | $ (1.43)
Weighted average number of shares, basic and diluted |  |  |  |  | 44,056,407 | 43,939,281 | 43,797,718 | 43,508,592 | 54,787,118 | 43,825,991 | 34,618,237

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