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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement [Abstract] |  |  |  |
Revenue | $ 5,389 | $ 1,874 | $ 10,851 | $ 3,402
Operating expenses |  |  |  |
Research and development | 22,760 | 10,869 | 42,721 | 18,986
General and administrative | 6,500 | 3,130 | 11,495 | 5,776
Total operating expenses | 29,260 | 13,999 | 54,216 | 24,762
Loss from operations | (23,871) | (12,125) | (43,365) | (21,360)
Other income (expense), net: |  |  |  |
Change in fair value of convertible note payable | 2,950 |  | (9,758) |
Interest expense |  |  | (182) |
Interest income | 1,485 | 299 | 2,086 | 522
Total other income (expense), net | 4,435 | 299 | (7,854) | 522
Net loss and net loss attributable to common stockholders | $ (19,436) | $ (11,826) | $ (51,219) | $ (20,838)
Net loss per share attributable to common stockholders- basic and diluted | $ (0.39) | $ (0.75) | $ (1.55) | $ (1.33)
Weighted average shares of common stock outstanding- basic and diluted | 50,035,370 | 15,730,747 | 33,095,314 | 15,717,719

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