UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Collaboration revenue	$ 9,183	$ 25
Total revenue	9,183	25
Operating expenses:
Research and development expense	6,075	3,395
General and administrative expense	2,574	2,208
Total operating expenses	8,649	5,603
Operating income (loss)	534	(5,578)
Other income (expense), net:
Dividend income	39	105
Interest income	360	1
Interest expense	(128)	(183)
Other income (expense), net	345	369
Total other income (expense), net	616	292
Net income (loss)	$ 1,150	$ (5,286)
Basic earnings (loss) per common share (USD per share)	$ 0.01	$ (0.12)
Diluted earnings (loss) per common share (USD per share)	$ 0.01	$ (0.12)
Weighted-average basic common shares outstanding (USD per share)	87,079,160	44,358,000
Weighted-average diluted common shares outstanding (USD per share)	88,244,632	44,358,000