Combined Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating expenses:
Research and development	$ 1,845	$ 9,838	$ 18,578	$ 25,664
General and administrative	4,524	5,107	21,809	24,170
Change in contingent consideration valuation	3,909	4,115	(15,241)	7,030
Total operating expenses	10,278	19,060	25,146	56,864
Operating loss	(10,278)	(19,060)	(25,146)	(56,864)
Other income (expense):
Other income (expense)	(37)	(32)	(86)	(122)
Net loss	$ (10,315)	$ (19,092)	$ (25,232)	$ (56,986)