Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Schedule of Company's losses before income taxes and provision (benefit) for income taxes

The Company's losses before income taxes and provision (benefit) for income taxes is as follows (in thousands):

	Year ended December 31,
			(As Restated)
	2023		2022
Loss before income taxes	$	(63,078)	$	(86,804)
Provision (benefit) for income taxes	—		—

Schedule of Effective Income Tax Rate

A reconciliation of the federal statutory income tax rate to the Company's effective income tax rate is as follows:

	Year ended December 31,
			(As Restated)
	2023		2022
Expected provision at statutory rate	21.0	%	21.0	%
State income tax, net of federal benefit	6.4	%	7.4	%
Tax credits	3.5	%	3.1	%
Change in state tax rate	(2.8)	%	(11.1)	%
Other, net	(1.6)	%	(1.6)	%
Change in valuation allowance	(26.5)	%	(18.8)	%
Effective tax rate	—	%	—	%

Schedule of Deferred Tax Assets

The Company's deferred tax assets (liabilities) are comprised of the following (in thousands):

	As of December 31,
			(As Restated)
	2023		2022
Deferred tax assets:
Net operating loss carryforwards	$	58,324	$	48,812
Capital loss carryforwards	7,298		7,298
Start-up costs	9,699		9,699
Accruals and reserves	276		629
Intellectual property	4,565		5,057
Stock-based compensation	2,873		2,150
Capitalization of research and development expense	18,702		12,571
Deferred revenue	1,293		2,799
Tax credits	9,324		6,655
Lease liabilities	977		1,029
Total deferred tax assets	113,331		96,699
Valuation allowance	(112,413)		(95,724)
Deferred tax assets, net of valuation allowance	$	918	$	975
Deferred tax liabilities:
Lease right-of-use assets	(918)		(975)
Net deferred tax assets	$	—	$	—

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

	Year ended December 31,
			(As Restated)
	2023		2022
Gross unrecognized tax benefits at beginning of year	$	303	$	303
Additions for tax positions taken in a prior year	—		—
Additions for tax positions taken in the current year	—		—
Reductions for tax positions taken in the prior year due to settlement	—		—
Reductions for tax positions taken in the prior year due to statutes lapsing	—		—
Gross unrecognized tax benefits at end of year	$	303	$	303