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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cash flows used in operating activities: |  |
Net (loss)/income | $ (71,071) | $ 5,157
Adjustments to reconcile net income/(loss) to net cash used in operating activities: |  |
Depreciation | 1,854 | 1,111
Stock-based compensation | 13,267 | 12,255
Amortization of capitalized debt issuance costs |  | 75
Non-cash lease expense | 814 | 829
Change in fair value of warrant liabilities | (5,191) | (84,000)
Change in accrued interest and net accretion of discounts on short-term investments | (1,232) |
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets | 1,420 | 671
Accounts payable | (473) | 135
Accrued expenses | (833) | 1,711
Lease liabilities | (838) | 937
Other noncurrent assets | (22) | (92)
Net cash used in operating activities | (62,305) | (61,211)
Cash flows from investing activities: |  |
Purchases of property and equipment | (1,670) | (5,352)
Purchases of available-for-sale investments | (75,704) |
Proceeds from sales and maturities of available-for-sale investments | 31,591 |
Net cash used in investing activities | (45,783) | (5,352)
Cash flows from financing activities: |  |
Repayment of equipment loans | (16) | (47)
Gross proceeds from issuance of common stock | 47,045 | 10,000
Issuance costs related to issuance of common stock | (2,823) | (300)
Repayment of term loan |  | (1,350)
Proceeds from short swing rule | 200 |
Proceeds from exercise of stock options | 296 | 842
Net cash provided by financing activities | 44,702 | 9,145
Change in cash, cash equivalents and restricted cash | (63,386) | (57,418)
Cash, cash equivalents and restricted cash, beginning of year | 117,144 | 174,562
Cash, cash equivalents and restricted cash, end of year | 53,758 | 117,144
Reconciliation of restricted cash: |  |
Cash and cash equivalents | 52,822 | 116,208
Restricted cash | 936 | 936
Reconciliation of restricted cash total | 53,758 | 117,144
Supplemental cash flow information: |  |
Interest paid | 1 | 41
Non-cash investing and financing activities: |  |
Leasehold improvements acquired in connection with Waltham lease |  | 1,200
Accruals for property, plant and equipment purchased during the period |  | $ 95

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