Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Consolidated Statements of Operations (Unaudited)
License and collaboration revenue - related party	$ 3,647	$ 1,560
Operating expenses:
Research and development	18,768	12,444
General and administrative	4,576	3,764
Total operating expenses	23,344	16,208
Loss from operations	(19,697)	(14,648)
Interest income	526	731
Interest expense	(243)
Other expense, net	(490)	(3)
Loss before income tax expense	(19,904)	(13,920)
Income tax expense	(176)	(183)
Net loss	$ (20,080)	$ (14,103)
Net loss per share, basic and diluted	$ (0.72)	$ (0.58)
Weighted-average shares used to compute net loss per share, basic and diluted	27,703,918	24,297,576