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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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