Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Information
Number of reportable segments | segment			2
Revenue from external customers	$ 2,773	$ 973	$ 6,809	$ 4,268
Segment net loss	(7,866)	(7,555)	(25,040)	(32,580)
Segment assets	36,234		36,234		$ 36,410
Less: investment in subsidiary	(29,241)		(29,241)		(29,241)
Less: Intercompany loan	(37,921)		(37,921)		(34,950)
Human Health
Segment Information
Segment net loss	(1,912)	(3,955)	(6,721)	(16,586)
Segment assets	33,930		33,930		32,432
Animal Health
Segment Information
Segment net loss	(5,954)	(3,600)	(18,319)	(15,994)
Segment assets	69,466		69,466		68,169
Product revenue, net
Segment Information
Revenue from external customers	2,773	973	6,809	4,268
Product revenue, net | Human Health
Segment Information
Revenue from external customers	2,760	957	6,748	4,185
Product revenue, net | Animal Health
Segment Information
Revenue from external customers	13	$ 16	61	$ 83
Operating Segments
Segment Information
Segment assets	$ 103,396		$ 103,396		$ 100,601