Income Taxes - Reconciliation of Statutory Income Tax Rate (Detail) - Singapore [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Singapore statutory income tax rate	17.00%	17.00%
Federal and state tax credits	5.10%	5.40%
Permanent differences	(2.60%)	(2.40%)
Changes in reserves for uncertain tax positions	(2.10%)	(1.30%)
Foreign rate differential	6.30%	6.10%
Tax rate change	12.50%	2.60%
Other	(1.10%)	(1.20%)
Change in deferred tax asset valuation allowance	(34.90%)	(25.60%)
Effective income tax rate	0.20%	0.60%