Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Net operating loss and credit carryforwards	$ 4,828	$ 4,539
Stock-based compensation expense	3,934	3,605
Accounts receivable allowances	1,336	1,228
Accrued expenses	5,174	3,200
Deferred revenue	1,300	695
Operating lease liabilities	5,235	5,435
Other	142	660
Gross deferred tax assets	21,949	19,362
Less: valuation allowance	(1,815)	(1,582)
Total net deferred tax assets	20,134	17,780
Deferred tax liabilities
Deferred costs	(15,126)	(12,561)
Right-of-use assets	(2,787)	(3,754)
Foreign operations	(364)	(228)
Depreciation and amortization	(8,820)	(3,980)
Total deferred tax liabilities	(27,097)	(20,523)
Net deferred tax liabilities	$ (6,963)	$ (2,743)