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Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement [Abstract] |  |  |  |  |
Revenues (including amounts from related parties of $0 and $2,813 during the three and nine months ended September 30, 2020, respectively, and $6,274 and $16,687 during the three and nine months ended September 30, 2019, respectively) (1) | [1] | $ 17,823 | $ 12,277 | $ 34,444 | $ 31,431
Operating expenses |  |  |  |  |
Research and development |  | 19,361 | 16,897 | 54,223 | 48,220
General and administrative |  | 9,079 | 8,115 | 26,435 | 23,897
Total operating expenses |  | 28,440 | 25,012 | 80,658 | 72,117
Loss from operations |  | (10,617) | (12,735) | (46,214) | (40,686)
Interest income |  | 295 | 964 | 1,320 | 3,264
Unrealized gain on equity securities |  | 29,778 |  | 78,638 |
Interest and other expense, net |  | (2,317) | (1,141) | (6,328) | (3,533)
Net income (loss) |  | $ 17,139 | $ (12,912) | $ 27,416 | $ (40,955)
Net income (loss) per share, basic |  | $ 0.46 | $ (0.56) | $ 0.91 | $ (1.79)
Net income (loss) per share, diluted |  | $ 0.45 | $ (0.56) | $ 0.90 | $ (1.79)
[1] | Includes $0 and $2.8 million, respectively, for the three months and nine months ended September 30, 2020 of related party revenue from Merck. Merck was a related party until the closing of the Company’s public offering on May 14, 2020.

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