Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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US Government Contract - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue			$ 28,058,000	$ 18,130,000
Contribution [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue			11,412,000	6,442,000
Co Development Partnership Agreement [Member] \| Biomedical Advanced Research and Development Authority [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Initial value of consideration receivable					$ 6,000,000.0
First contract option value exercised		$ 10,500,000
Option contract value exercised	$ 6,400,000
Co Development Partnership Agreement [Member] \| Biomedical Advanced Research and Development Authority [Member] \| Contribution [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue			$ 11,400,000	$ 6,400,000
Co Development Partnership Agreement [Member] \| Biomedical Advanced Research and Development Authority [Member] \| Maximum [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Aggregate consideration receivable					$ 69,000,000.0