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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Net loss $ (81,172) $ (58,032)
Adjustments to reconcile net loss to net cash used in operating activities:    
Non-cash lease expense 3,610 1,396
Stock-based compensation expense 2,381 1,140
Depreciation expense 3,630 2,511
Non-cash interest expense 0 118
Net amortization of premiums and discounts on investments (80) (145)
Loss on disposal of property and equipment 65 0
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 559 (28)
Accounts payable 3,100 1,755
Accrued expenses 1,270 (39)
Operating lease liabilities 1,341 (2,198)
Other non-current assets (1,987) (123)
Net cash used in operating activities (67,283) (53,645)
Investing Activities    
Purchases of investments (37,213)
Proceeds from maturities of investments 19,000 53,485
Purchases of property and equipment (7,836) (5,136)
Advance payments for property and equipment not yet received (76)
Net cash provided by (used in) investing activities 11,164 11,060
Financing Activities    
Proceeds from exercises of stock options 702 62
Proceeds from the issuance of common stock in pre-closing financing 117,250 0
Cash acquired in connection with the reverse recapitalization 36,600 0
Payment of reverse recapitalization transaction costs (12,247) 0
Other financing activities, net (2) (44)
Net cash provided by financing activities 187,761 18
Net (decrease) increase in cash, cash equivalents, and restricted cash 131,642 (42,567)
Cash, cash equivalents and restricted cash, beginning of period 41,477 84,044
Cash, cash equivalents and restricted cash, end of period 173,119 41,477
Noncash Investing and Financing Items [Abstract]    
Property and equipment capitalized under tenant improvement allowance 2,271 0
Purchases of property and equipment in accounts payable and accrued expenses 1,983 402
Operating Lease Liabilities Arising From Right-Of-Use Assets 26,777 5,629
Operating lease liabilities arising from lease modification 1,959 0
Supplemental cash flow information    
Cash paid for income taxes 27 11
Cash paid for operating lease liabilities 2,978 2,335
Series B-2 Preferred Stock [Member]    
Financing Activities    
Proceeds from Series convertible preferred stock, net of issuance costs $ 45,458 $ 0