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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities |  |
Net loss | $ (29,075) | $ (32,055)
Adjustments to reconcile net loss to net cash used in operating activities |  |
Stock-based compensation expense | 11,593 | 10,500
Loss on disposal of fixed assets | 0 | 1
Impairment of capitalized software development costs | 1,717 | 0
Change in allowance for credit losses | 40 | (1)
Inventory write-downs | 284 | 380
Depreciation and amortization expense | 823 | 846
Amortization of debt discount and debt issuance costs | 30 | 22
Net accretion of discounts on marketable securities | (871) | (437)
Non-cash lease expense | 1,211 | 1,324
Net changes in operating assets and liabilities: |  |
Accounts receivable | 792 | (184)
Inventory | (672) | (267)
Prepaid expenses and other current assets | 622 | 25
Other assets | 66 | 17
Accounts payable | 1,630 | 350
Accrued liabilities | (4,246) | 501
Income taxes payable | (22) | 19
Lease liabilities | (1,492) | (1,550)
Deferred revenue | 5 | (26)
Net cash used in operating activities | (17,565) | (20,535)
Cash flows from investing activities |  |
Purchases of investments | (20,837) | (25,624)
Maturities of investments | 18,415 | 25,500
Purchases of property and equipment and internal software development costs | (920) | (115)
Net cash used in investing activities | (3,342) | (239)
Cash flows from financing activities |  |
Proceeds from borrowing under term loan | 0 | 20,000
Repayment of credit agreement | (46) | (47)
Proceeds from exercise of common stock options | 80 | 183
Proceeds from issuance of common stock under the employee stock purchase plan | 808 | 676
Net cash provided by financing activities | 842 | 20,812
Effect of exchange rate changes on cash and cash equivalents | 2 | 42
Net (decrease) increase in cash, cash equivalents, and restricted cash | (20,063) | 80
Cash, cash equivalents, and restricted cash at beginning of the period | 83,784 | 101,967
Cash, cash equivalents, and restricted cash at end of the period | 63,721 | 102,047
Reconciliation of cash, cash equivalents, and restricted cash to consolidated balance sheets: |  |
Cash and cash equivalents | 63,464 | 101,581
Restricted cash | 257 | 466
Cash, cash equivalents, and restricted cash in consolidated balance sheets | 63,721 | 102,047
Supplemental non-cash items: |  |
Lapse in repurchase rights of common stock | 0 | 103
Purchases of property and equipment in accounts payable and accrued liabilities | 169 | 450
Supplemental disclosure of cash flow information: |  |
Cash paid for income taxes | 276 | 206
Cash paid for interest | $ 1,778 | $ 1,235

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