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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Line Items]
Number of operating segments | segment			1
Foreign currency transaction gains (losses)	$ (1,400)	$ 1,400	$ (1,002)	$ (1,039)
Other Noncurrent Assets
Accounting Policies [Line Items]
Deferred offering costs non current	$ 5,600		$ 5,600		$ 0
Customer One | Accounts Receivable | Customer Concentration Risk
Accounting Policies [Line Items]
Concentration risk percentage					20.00%
Outside United States | Revenue Benchmark | Geographic Concentration Risk
Accounting Policies [Line Items]
Concentration risk percentage	0.80%	0.90%	0.90%	1.60%
Outside United States | Property, Plant and Equipment | Geographic Concentration Risk
Accounting Policies [Line Items]
Property plant and equipment percent	1.00%		1.00%		1.00%

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Accounting policies.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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