License, Collaboration, and Funding Agreements - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Collaboration License And Funding Arrangements [Line Items]
Other income		$ 194	$ 149	$ 235	$ 149
License revenue		0	$ 0	$ 3,000	$ 0
AUSTRIA
Collaboration License And Funding Arrangements [Line Items]
Grant income (in percentage)				14.00%
Research and Development Incentive
Collaboration License And Funding Arrangements [Line Items]
Grant receivable		500		$ 500
Other income		85		171
Abbisko Agreement
Collaboration License And Funding Arrangements [Line Items]
Potential milestone payments receivable		208,000		208,000
One time upfront payment	$ 3,000
License revenue		3,000
Accounts Receivable, before Allowance for Credit Loss, Current		$ 3,000		$ 3,000