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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net loss | $ (28,948) | $ (26,985) | $ (23,786)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 2,827 | 2,744 | 1,530
Amortization of right-of-use assets | 1,761 | 1,795 | 1,777
Amortization of intangible assets | 265 | 202 | 153
Amortization of debt discount and deferred financing fees | 891 | 831 | 232
Loss on disposal of equipment | 0 | 0 | 3
Provision for bad debt | 612 | (41) | (105)
Provision for inventory write-down | 1,769 | 3,314 | 2,242
Investment losses (gains) | (228) | 68 | (47)
Change in fair value of derivatives | (1,044) | 28 | 117
Stock-based compensation | 15,591 | 10,919 | 8,470
Change in operating assets and liabilities: |  |  |
Accounts receivable | (4,639) | (499) | (635)
Inventory | (3,656) | (7,478) | (910)
Prepaid expenses and other | (84) | 2,435 | (2,524)
Accounts payable and accrued expenses | 660 | (270) | 4,958
Operating lease obligations | (1,841) | (463) | (1,086)
Cash paid for interest portion of finance leases | (2) | (2) | (3)
Contract and other liabilities | 0 | (3) | (12)
Net cash used in operating activities | (16,066) | (13,405) | (9,626)
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (20,078) | (27,811) | (21,905)
Economic development grant proceeds | 0 | 950 | 0
Purchase of investments | (39,247) | (68,699) | (77,806)
Proceeds from sale of investments | 57,300 | 72,500 | 83,440
Cash payments for intangible assets | (1,175) | (589) | (692)
Net cash used in investing activities | (3,200) | (23,649) | (16,963)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt | 0 | 15,000 | 35,000
Proceeds from the paycheck protection program loan | 0 | 0 | 7,820
Repayment of the paycheck protection program loan | 0 | 0 | (7,820)
Proceeds from issuance of common stock | 0 | 0 | 3,500
Payments for debt issuance costs | 0 | 0 | (642)
Cash paid for debt portion of finance leases | (12) | (15) | (14)
Proceeds from exercise of stock options and ESPP stock purchases | 1,806 | 5,467 | 3,300
Payments of employee tax withholdings in exchange of common stock awards | 0 | 0 | (670)
Net cash provided by financing activities | 1,794 | 20,452 | 40,474
Net (decrease) increase in cash, cash equivalents, and restricted cash | (17,472) | (16,602) | 13,885
Cash, cash equivalents, and restricted cash, beginning of period | 39,007 | 55,609 | 41,724
Cash, cash equivalents, and restricted cash, end of period | 21,535 | 39,007 | 55,609
Supplemental disclosures of cash flow activity: |  |  |
Cash paid for interest, net of capitalized interest | 0 | 495 | 822
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Acquisition of fixed assets in accounts payable and accrued expenses | 866 | 1,420 | 1,077
Acquisition of leasehold asset | 0 | 0 | 5,250
Embedded derivative associated with the long-term debt | 0 | 3,037 | 2,563
Obtaining a right-of-use asset in exchange for a lease liability | 1,018 | 1,375 | 14,259
Conversion of the Credit Facility option | 0 | 0 | 182
Acquisition of intangible assets in accounts payable and accrued expenses | $ 299 | $ 418 | $ 0

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