The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_SecurityDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Cash - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Cash And Cash Equivalents [Line Items]
Restricted Cash	$ 1.5		$ 1.5
Security deposit	0.5
Letter of Credit [Member] \| Technology Square [Member]
Cash And Cash Equivalents [Line Items]
Security deposit	0.5	$ 0.5
Letter of Credit [Member] \| Hampshire Street [Member]
Cash And Cash Equivalents [Line Items]
Security deposit	$ 1.0	$ 1.0