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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 | $ (12,395) | $ (74,827)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 7,945 | 21,847
Depreciation and amortization | 1,330 | 1,457
Amortization of debt discount | 180 | 103
Amortization of debt issuance costs | 104 |
Accretion of discount on short-term investments | (1,211) | (835)
Impairment of property and equipment | 3,441 | 309
Loss on disposal of property and equipment |  | 23
Change in operating assets and liabilities: |  |
Accounts receivable | (13,571) | (24,644)
Inventory | (754) | 9,950
Prepaid expenses and other assets | 67 | 10,369
Accounts payable | 6,986 | (1,268)
Accrued clinical and manufacturing liabilities | (4,605) | (4,587)
Accrued payroll and employee liabilities | (2,139) | (3,560)
Other accrued and other non-current liabilities | 502 | 13,598
Net cash used in operating activities | (14,120) | (52,065)
Investing activities: |  |
Purchases of short-term investments | (65,100) | (28,381)
Maturities and sales of short-term investments | 69,063 | 78,935
Purchases of property and equipment | (637) | (502)
Net cash provided by investing activities | 3,326 | 50,052
Financing activities: |  |
Receipts (Payments) for stock issued under the equity incentive plan | 328 | (593)
Proceeds from purchases under the employee stock purchase plan | 175 | 704
Net cash provided by financing activities | 503 | 111
Net decrease increase in cash and cash equivalents | (10,291) | (1,902)
Cash and cash equivalents at beginning of year | 28,677 | 15,364
Cash and cash equivalents at end of period | 18,386 | 13,462
Supplemental disclosure of cash flow information: |  |
Interest paid | $ 2,426 | $ 1,125

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