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Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Operating activities |  |
Net loss | $ (8,562) | $ (7,525)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 239 | 243
Non-cash stock-based compensation | 1,240 | 859
Amortization of financing lease right-of-use assets | 204 | 188
Amortization of operating lease right-of-use assets | 189 | 159
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets | 603 | 510
Other non-current assets | (65) | 0
Accounts payable | 489 | (1,035)
Accrued expenses and other current liabilities | (2,060) | (667)
Short-term operating lease liabilities | 37 | 25
Long-term operating lease liabilities | (233) | (196)
Net cash used in operating activities | (7,919) | (7,439)
Investing activities |  |
Purchases of property and equipment | (50) | (371)
Construction in progress | (21) | (58)
Net cash used in investing activities | (71) | (429)
Financing activities |  |
Payment of issuance costs | (89) | 0
Proceeds from the issuance of common stock, net of issuance costs | 0 | 722
Principal payments on financing leases | (188) | (175)
Net cash (used in) provided by financing activities | (277) | 547
Net decrease in cash and restricted cash | (8,267) | (7,321)
Cash and restricted cash at beginning of period | 21,538 | 18,434
Cash and restricted cash at end of period | 13,271 | 11,113
Cash, end of period | 13,015 | 10,860
Restricted cash, end of period | 256 | 253
Cash and restricted cash, end of period | 13,271 | 11,113
Supplemental disclosure of non-cash operating, financing and investing information |  |
Initial measurement of operating lease right-of-use assets and liabilities | 714 | 0
Lease modification of operating lease right-of-use assets and liabilities | $ 492 | $ 0

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