Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) Lease	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Number of finance lease | Lease	0
ROU assets	$ 307	$ 900
Lease liabilities	$ 1,166	900
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, early adoption [true false]	true
Accounting standard update material impact	true
Accounting standard update adoption date	Jan. 01, 2021
ROU assets		900
Lease liabilities		$ 900
ASU 2019-12
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounting standard update material impact	true
Accounting standard update adoption date	Jan. 01, 2021
Accounting standard update adopted	true
Additional Paid-in Capital
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
IPO-related costs	$ 3,400
Other Assets
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred offering costs	$ 500		$ 100