Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Sep. 30, 2022 USD ($)
Prepaid Expenses and Other Current Assets [Member]
Contingencies And Commitments [Line Items]
Letters of credit secured by cash held in restricted depository account	$ 4,053
Prepaid expenses and other current assets	4,053
Restricted cash	4,053
Letter of Credit [Member]
Contingencies And Commitments [Line Items]
Letters of credit secured by cash held in restricted depository account	16,200
Prepaid expenses and other current assets	16,200
Restricted cash	16,200
Letter of Credit [Member] | Prepaid Expenses and Other Current Assets [Member]
Contingencies And Commitments [Line Items]
Letters of credit secured by cash held in restricted depository account	4,100
Prepaid expenses and other current assets	4,100
Restricted cash	4,100
Letter of Credit [Member] | Restricted Cash Noncurrent [Member]
Contingencies And Commitments [Line Items]
Letters of credit secured by cash held in restricted depository account	12,100
Prepaid expenses and other current assets	12,100
Restricted cash	12,100
2015 Collaboration Agreement [Member] | Vertex Pharmaceuticals Incorporated and Certain of its Subsidiaries [Member]
Contingencies And Commitments [Line Items]
Milestone payment receivable	$ 395,000