Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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Balance Type:	credit
Period Type:	instant

Commitment and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	Jul. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Feb. 28, 2017
Indemnification Agreements
Contingencies And Commitments [Line Items]
Accrued liabilities		$ 0	$ 0
Adimab Option and License Agreement
Contingencies And Commitments [Line Items]
Option fee including up front payment				$ 250
Potential milestone payments	$ 25,000