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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Operating activities: |  |
Net loss | $ (3,160) | $ (32,768)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 3,375 | 7,947
Depreciation and amortization | 689 | 718
Amortization of debt discount | 88 |
Amortization of debt issuance costs | 52 | 51
Accretion of discount on short-term investments | (638) | (474)
Impairment of property and equipment | 170 | 154
Changes in operating assets and liabilities: |  |
Accounts receivable | (5,185) | 601
Inventory | (363) | 2,514
Prepaid expenses and other assets | (222) | 906
Accounts payable | (2,403) | 840
Accrued clinical and manufacturing liabilities | (2,347) | (3,195)
Accrued payroll and employee liabilities | (1,577) | (3,906)
Other accrued and other non-current liabilities | 2,005 | 1,712
Net cash used in operating activities | (9,516) | (24,900)
Investing activities: |  |
Purchases of short-term investments | (37,892) | (13,942)
Maturities and sales of short-term investments | 39,170 | 51,000
Purchases of property and equipment |  | (224)
Net cash provided by investing activities | 1,278 | 36,834
Financing activities: |  |
Payments for stock issued under the equity incentive plan | 11 | (208)
Net cash provided by (used in) financing activities | 11 | (208)
Net (decrease) increase in cash and cash equivalents | (8,227) | 11,726
Cash and cash equivalents at beginning of period | 28,677 | 15,364
Cash and cash equivalents at end of period | 20,450 | $ 27,090
Supplemental disclosure of cash flow information: |  |
Interest paid | $ 649 |

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