Revenues - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Deferred revenue, recognized		$ 800
Deferred revenue		701	$ 1,572
Circle [Member]
Disaggregation Of Revenue [Line Items]
Deferred revenue, recognized	$ 600
Deferred revenue		$ 700
Contract termination date		Apr. 15, 2021
Amortization of intangible assets remaining	$ 300
Finite lived intangible assets remaining amortization		$ 400
Circle [Member] | Selling and Marketing Expense [Member]
Disaggregation Of Revenue [Line Items]
Impairment charge of intangible assets		$ 1,500