Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Increase (decrease) in valuation allowance	$ 72,900	$ 35,900
Valuation allowance for deferred tax assets, description	The Company has provided a valuation allowance for the full amount of the net deferred tax assets as the realization of the deferred tax assets is not determined to be more likely than not. The valuation allowance increased by $72.9 million in 2023 due to the increase in deferred tax assets, primarily driven by the generation of net operating losses and capitalized research expenses, and capitalized start-up costs. The valuation allowance increased by $35.9 million in 2022 due to the increase in deferred tax assets, primarily driven by the generation of net operating losses and capitalized start-up costs, partially offset by a decrease to other deferred tax assets.
Federal net operating losses	$ 136,400
State net operating losses	63,500
Uncertain tax positions	100
Deferred tax asset	79,600
Deferred tax assets, Expenses required to be capitalized	53,700
Internal Revenue Service [Member]
Income Taxes [Line Items]
Interest or penalties recorded during the period	0	$ 0
Unrecognized income tax benefits that would affect effective tax rate	$ 0
Federal [Member]
Income Taxes [Line Items]
Operating loss carryforward expiration period	2026
Deferred tax assets research credits	$ 8,900
Deferred tax assets research credits expiration period	2024
Federal [Member] | Indefinite Carryforward Period [Member]
Income Taxes [Line Items]
Federal net operating losses	$ 114,300
State net operating losses	900
Federal [Member] | Begin to Expire in 2026 [Member]
Income Taxes [Line Items]
Federal net operating losses	22,100
State [Member]
Income Taxes [Line Items]
Current State Income Expense	$ 300
Operating loss carryforward expiration period	2026
Deferred tax assets research credits	$ 3,800
Deferred tax assets research credits expiration period	2024
State [Member] | Begin to Expire in 2026 [Member]
Income Taxes [Line Items]
Federal net operating losses	$ 62,600