Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Summary of Collaboration and License Agreement Revenues by Collaborator

Collaboration and license agreement revenues by collaborator are summarized as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(dollars in thousands)	2020		2019		2020		2019
Takeda	$	5,598	$	28,760	$	15,913	$	72,139
Other	700		7,370		6,025		8,569
Collaboration and license agreement revenues	$	6,298	$	36,130	$	21,938	$	80,708