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Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Cash flows from operating activities: |  |
Net Income (Loss) | $ (18,192) | $ (11,880)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation | 122 | 83
Stock-based compensation | 4,115 | 2,433
Accretion on marketable securities, net | (1,229) | 0
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | (43) | 1,530
Accounts payable, accrued expenses and other liabilities | (6,906) | (2,022)
Right-of-use assets and lease liabilities, net | 105 | 9
Net cash used in operating activities | (22,028) | (9,847)
Cash flows from investing activities: |  |
Purchases of marketable securities | (11,791) | 0
Sales and maturities of marketable securities | 30,000 | 0
Purchases of property and equipment | (136) | (41)
Net cash provided by (used in) investing activities | 18,073 | (41)
Cash flows from financing activities: |  |
Proceeds from issuances of common stock under benefit plans | 484 | 376
Proceeds from issuance of common stock and pre-funded warrants from Private Placement | 200,000 | 0
Payments of issuance costs for common stock and pre-funded warrants from Private Placement | (169) | 0
Net cash provided by financing activities | 200,315 | 376
Net cash increase (decrease) for the period | 196,360 | (9,512)
Cash, cash equivalents and restricted cash at beginning of the period | 59,006 | 252,213
Cash, cash equivalents and restricted cash at end of the period | 255,366 | 242,701
Reconciliation of cash, cash equivalents and restricted cash to the balance sheet |  |
Cash and cash equivalents | 254,366 | 241,701
Restricted cash | 1,000 | 1,000
Total cash, cash equivalents and restricted cash | 255,366 | 242,701
Supplemental disclosure of cash flow information: |  |
Purchases of equipment included in accounts payable and accrued and other current liabilities | 9 | 0
Vesting of options early exercised subject to repurchase | 17 | 32
Issuance costs for common stock and pre-funded warrants from Private Placement included in accounts payable and accrued liabilities | $ 251 | $ 0

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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-11 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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