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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating activities |  |  |
Net loss | $ (20,961,000) | $ (37,647,000) | $ (42,825,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 1,855,000 | 2,599,000 | 2,984,000
Stock-based compensation | 22,867,000 | 20,271,000 | 24,456,000
Non-cash operating lease cost | 2,482,000 | 2,308,000 | 1,575,000
Changes in valuation of warrant investment | 0 |  | 2,183,000
Net loss on sale of available-for-sale securities | 7,000 | 54,000 | 108,000
Unrealized gain on investments | (135,000) | (170,000) | (564,000)
Loss on disposal of fixed assets | 3,000 | 65,000 |
Impairment charges for facilities consolidation | 0 | 1,698,000 |
Non-cash interest expense | 398,000 | 374,000 | 609,000
Foreign currency remeasurement (gain) loss | (388,000) | (685,000) | 1,911,000
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 5,504,000 | (1,102,000) | (9,200,000)
Inventories | 7,030,000 | (14,947,000) | (1,768,000)
Prepaid and other assets | (3,025,000) | (994,000) | 1,168,000
Accounts payable | (1,477,000) | (7,335,000) | (4,905,000)
Accrued liabilities and other non-current liabilities | (2,198,000) | (9,070,000) | (1,263,000)
Deferred revenue | (603,000) | 1,413,000 | (84,000)
Net cash provided by (used in) operating activities | 11,359,000 | (43,168,000) | (25,615,000)
Investing activities |  |  |
Capital expenditures | (2,837,000) | (4,597,000) | (2,000,000)
Purchases of investments | (42,975,000) | (2,486,000) | (29,640,000)
Proceeds from maturities and sale of investments | 37,682,000 | 15,707,000 | 40,104,000
Net cash (used in) provided by investing activities | (8,130,000) | 8,624,000 | 8,464,000
Financing activities |  |  |
Net proceeds from equity incentives | 804,000 | 925,000 | 4,084,000
Net costs from public offerings | (137,000) | (175,000) | (104,000)
Net (payments on) proceeds from revolving line of credit | (703,000) | 5,091,000 | 212,000
Proceeds from loans, net of issuance costs | 5,000,000 | 4,832,000 |
Net cash provided by financing activities | 4,964,000 | 10,673,000 | 4,192,000
Effect of exchange rates on cash, cash equivalents, and restricted cash | (191,000) | (128,000) | (727,000)
Net increase (decrease) in cash, cash equivalents, and restricted cash | 8,002,000 | (23,999,000) | (13,686,000)
Cash, cash equivalents and restricted cash, beginning of period | 13,359,000 | 37,358,000 | 51,044,000
Cash, cash equivalents and restricted cash, end of period | 21,361,000 | 13,359,000 | 37,358,000
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 9,295,000 | 9,210,000 | 5,100,000
Cash paid for income taxes | $ 356,000 | $ 322,000 | $ 270,000

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