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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities: |  |
Net loss | $ (24,172) | $ (25,761)
Adjustments to reconcile net loss to cash used in operating activities: |  |
Depreciation and amortization | 978 | 1,276
Stock-based compensation expense | 2,869 | 1,697
Change in fair value of warrant and derivative liabilities | (7,626) | 6,364
Non-cash gain of right-of-use lease assets |  | (1,065)
Accretion and interest on short-term investments | (66) | (74)
Amortization of right-of-use lease assets | 431 | 450
Non-cash interest | 735 | 204
(Gain) loss on disposal of property and equipment | (2) | 47
Change in operating assets and liabilities: |  |
Accounts receivable |  | (3,500)
Other receivables | 804 | (2,039)
Prepaid expenses and other current assets | (639) | (777)
Other assets | 177 | (65)
Accounts payable and accrued expenses | (121) | 1,836
Lease liabilities | (590) | (622)
Other current liabilities |  | 1
Net cash used in operating activities | (27,222) | (22,028)
Cash flows from investing activities: |  |
Capital expenditures | (1,436) | (250)
Proceeds from disposal of property and equipment | 18 | 179
Purchases of short-term investments | (89,890) | (14,156)
Proceeds from maturities of short-term investments | 39,359 | 21,649
Net cash (used in) provided by investing activities | (51,949) | 7,422
Cash flows from financing activities: |  |
Proceeds from ATM sales of common stock, net of issuance costs | 9,962 | 6,623
Payments related to net settlement of restricted share awards | (28) | (9)
Proceeds from underwritten sales of common stock, net of issuance costs | 70,153 |
Proceeds from issuance of long-term debt | 20,000 |
Payment of debt issuance costs | (963) |
Net cash provided by financing activities | 99,124 | 6,614
Net increase (decrease) in cash, cash equivalents and restricted cash | 19,953 | (7,992)
Cash, cash equivalents and restricted cash at beginning of period | 14,811 | 14,555
Cash, cash equivalents and restricted cash at end of period | 34,764 | 6,563
Supplemental cash flow information: |  |
Cash and cash equivalents | 34,426 | 6,225
Restricted cash | 338 | 338
Total cash, cash equivalents and restricted cash | 34,764 | 6,563
Supplemental non-cash flow information: |  |
Right-of-use asset obtained in exchange for new operating lease liabilities |  | 419
Derivative and warrant additions associated with loan and security agreement | 1,042 |
Cash paid for interest | 1,290 |
Cash paid for taxes | $ 7 | $ 6

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