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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Cash flows from operating activities |  |
Net loss | $ (26,313) | $ (19,027)
Adjustments to reconcile net loss to net cash used in operations: |  |
Depreciation and amortization | 1,800 | 2,524
Impairment of property and equipment | 13 |
Bargain purchase gain |  | (1,706)
Share-based compensation expense | 3,743 | 2,949
Inventory write-downs | 9 | 29
Net accretion of premium on short-term investments | (288) | (396)
Change in: |  |
Accounts receivable | (172) | (506)
Contract assets |  | (192)
Inventory | 102 | (87)
Other current and non-current assets | 992 | 647
Accounts payable | (527) | 1,629
Accrued liabilities | 1,331 | 2,017
Contract liabilities and other current liabilities | (480) | (711)
Operating lease liabilities | (639) | (669)
Other long-term liabilities | (330) | 17
Net cash used in operating activities | (20,759) | (13,482)
Cash flows from investing activities |  |
Sales of investment securities | 7,900 | 22,000
Purchases of investment securities | (7,805) | (3,898)
Purchases of property and equipment | (114) | (615)
Cash paid for Ibeo business combination | (3,263) | (11,233)
Net cash provided by (used in) investing activities | (3,282) | 6,254
Cash flows from financing activities |  |
Principal payments under finance leases |  | (6)
Proceeds from stock option exercises | 62 |
Net proceeds from issuance of common stock | 20,956 | 12,691
Net cash provided by financing activities | 21,018 | 12,685
Effect of exchange rate changes on cash and cash equivalents | (31) |
Change in cash, cash equivalents, and restricted cash | (3,054) | 5,457
Cash, cash equivalents, and restricted cash at beginning of period | 49,391 | 21,954
Cash, cash equivalents, and restricted cash at end of period | 46,337 | 27,411
Supplemental schedule of non-cash investing and financing activities |  |
Non-cash additions to property and equipment | 21 | 703
Acquisition of right-of-use asset |  | 234
Settlement of preexisting Advance to Ibeo in exchange for net assets acquired |  | 4,132
Amounts issued to escrow for acquisition consideration |  | 3,263
Accrued liability for Ibeo business combination | 2,969 | 2,928
Accrued financing fees | 396 |
Foreign currency translation adjustment | (19) | 107
Unrealized gain (loss) in investment securities, available-for-sale | $ (34) | $ 77

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