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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Operating activities: |  |
Net loss | $ (33,442) | $ (17,080)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 4,907 | 4,038
Depreciation expense | 918 | 859
Non-cash interest expense | 410 | 92
Non-cash lease expense | 541 | 675
Loss on extinguishment of debt | 553 | 0
Change in fair value of derivative liabilities | (1,609) | (1,030)
Amortization of debt issuance costs | 0 | 60
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | (474) | 863
Other receivables | 805 | 1
Other non-current assets | 329 | 0
Accounts payable, accrued expenses and other liabilities | 15 | (3,017)
Deferred revenue | (1,340) | (5,271)
Operating lease liability | (1,087) | (1,009)
Net cash used in operating activities | (29,474) | (20,819)
Investing activities: |  |
Purchases of property and equipment | (128) | (350)
Net cash used in investing activities | (128) | (350)
Financing activities: |  |
Proceeds from at the market offering of common stock, net of issuance costs | 21,124 | 9,265
Proceeds from drawdown of term loans | 30,000 | 40,000
Payment of debt issuance costs | (673) | 0
Repayment of term loan | (40,000) | 0
Proceeds from issuances under Employee Stock Purchase Plan | 76 | 45
Proceeds from stock option exercises | 12 | 5
Net cash provided by financing activities | 10,539 | 49,315
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents | (19,063) | 28,146
Cash, cash equivalents and restricted cash and cash equivalents—beginning of period | 155,577 | 130,529
Cash, cash equivalents and restricted cash and cash equivalents—end of period | 136,514 | 158,675
Reconciliation of cash, cash equivalents and restricted cash and cash equivalents to the condensed consolidated balance sheets |  |
Cash and cash equivalents | 135,303 | 137,452
Prepaid expenses and other current assets | 0 | 208
Restricted cash and cash equivalents, net of current portion | 1,211 | 21,015
Cash, cash equivalents and restricted cash and cash equivalents | 136,514 | 158,675
Supplemental disclosure of cash flow information: |  |
Cash paid for interest | 1,788 | 742
Supplemental disclosure of non-cash investing and financing activities: |  |
Purchases of property and equipment in accounts payable and accrued expenses | 0 | 13
Issuance costs in accounts payable and accrued expenses | 69 | 15
Fair value of derivative liability issued with term loan | $ 4,450 | $ 0

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