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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating activities |  |  |
Net loss | $ (37,647,000) | $ (42,825,000) | $ (54,376,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 2,599,000 | 2,984,000 | 3,148,000
Stock-based compensation | 20,271,000 | 24,456,000 | 23,571,000
Non-cash operating lease cost | 2,308,000 | 1,575,000 | 1,422,000
Changes in valuation of warrant investment |  | 2,183,000 | (148,000)
Loss (gain), net on sale of available-for-sale securities | 54,000 | 108,000 | (21,000)
Unrealized gain on investments | (170,000) | (564,000) | (267,000)
Impairment of long-lived assets |  |  | 387,000
Loss on disposal of fixed assets | 65,000 |  |
Impairment charges for facilities consolidation | 1,698,000 | 0 |
Non-cash interest expense | 374,000 | 609,000 | 591,000
Foreign currency remeasurement (gain) loss | (685,000) | 1,911,000 | 511,000
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (1,102,000) | (9,200,000) | (4,215,000)
Inventories | (14,947,000) | (1,768,000) | (19,610,000)
Prepaid and other assets | (994,000) | 1,168,000 | 2,738,000
Accounts payable | (7,335,000) | (4,905,000) | 12,204,000
Accrued liabilities and other non-current liabilities | (9,070,000) | (1,263,000) | 47,000
Deferred revenue | 1,413,000 | (84,000) | 96,000
Net cash used in operating activities | (43,168,000) | (25,615,000) | (33,922,000)
Investing activities |  |  |
Capital expenditures | (4,597,000) | (2,000,000) | (910,000)
Purchases of investments | (2,486,000) | (29,640,000) | (52,066,000)
Proceeds from maturities and sale of investments | 15,707,000 | 40,104,000 | 65,664,000
Net cash provided by investing activities | 8,624,000 | 8,464,000 | 12,688,000
Financing activities |  |  |
Net proceeds from equity incentives | 925,000 | 4,084,000 | 9,370,000
Net (costs) proceeds from public offerings | (175,000) | (104,000) | 2,743,000
Net proceeds on revolving line of credit | 5,091,000 | 212,000 | 6,181,000
Proceeds from loans, net of issuance costs | 4,832,000 |  | 15,000,000
Contribution from noncontrolling interest | 0 |  | 1,000,000
Net cash provided by financing activities | 10,673,000 | 4,192,000 | 34,294,000
Effect of exchange rates on cash, cash equivalents, and restricted cash | (128,000) | (727,000) | (919,000)
Net (decrease) increase in cash, cash equivalents and restricted cash | (23,999,000) | (13,686,000) | 12,141,000
Cash, cash equivalents and restricted cash, beginning of period | 37,358,000 | 51,044,000 | 38,903,000
Cash, cash equivalents and restricted cash, end of period | 13,359,000 | 37,358,000 | 51,044,000
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 9,210,000 | 5,100,000 | 4,181,000
Cash paid for income taxes | $ 322,000 | $ 270,000 | $ 278,000

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