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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating activities: |  |  |
Net loss | $ (152,149) | $ (144,326) | $ (78,994)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 41,168 | 26,756 | 10,949
Stock-based compensation | 40,556 | 36,450 | 17,659
Amortization of debt discount and debt issuance costs | 2,038 | 1,868 | 3,974
Amortization of right-of-use assets | 2,760 | 3,418 | 683
Write-down for excess and obsolete inventories | 9,792 | 11,147 | 7,044
Loss on disposal of assets | 2,594 | 1,976 | 498
Loss on debt extinguishment, net |  | 7,434 | 7,612
Impairment of investment |  | 3,000 |
Other | 1,187 | 2,721 | 116
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (18,832) | (10,141) | (7,484)
Inventories | (20,704) | (27,746) | (18,192)
Prepaid expenses and other current assets | 552 | 1,258 | (2,930)
Other assets | (109) | 11 | (51)
Accounts payable | 9,796 | 757 | 7,130
Accrued expenses and other current liabilities | 13,508 | 8,023 | 8,812
Lease liability | (2,678) | 150 | (1,312)
Contract liabilities | (2,280) | (1,040) |
Other long-term liabilities | (2,342) | 4,852 | (1,926)
Net cash used in operating activities | (75,143) | (73,432) | (46,412)
Investing activities: |  |  |
Purchases of property and equipment | (49,453) | (68,544) | (23,131)
Purchase of intangible assets | (8,827) |  | (755)
Acquisition of business, net of cash acquired |  | (62,133) |
Purchase of OCEANE |  | (21,097) |
Cash paid for investments |  | (3,000) |
Settlement of forward contract |  | (2,988) |
Cash received from sale of assets |  |  | 27
Net cash used in investing activities | (58,280) | (157,762) | (23,859)
Financing activities: |  |  |
Proceeds from Revolving Credit Facility and line of credit | 62,500 |  | 42,455
Payment of debt issuance costs | (1,315) | (10,028) |
Proceeds from common stock offering |  | 131,828 | 107,698
Proceeds from issuance of convertible notes |  | 316,250 |
Net cash (paid) received from common stock exercises | (3,041) | (5,963) | 3,341
Purchase of capped calls |  | (39,866) |
Repurchase of common stock |  | (25,000) |
Proceeds from term debt |  |  | 34,008
Repayment of Revolving Credit Facility and line of credit | (27,500) |  | (56,615)
Repayment of Squadron Medical Term Loan |  | (45,000) |
Repayment of Inventory Financing Agreement |  | (8,088) |
Other | 584 | (2,167) | (58)
Net cash provided by financing activities | 31,228 | 311,966 | 130,829
Effect of exchange rate changes on cash | (357) | (1,289) | 94
Net change in cash and cash equivalents | (102,552) | 79,483 | 60,652
Cash and cash equivalents at beginning of year | 187,248 | 107,765 | 47,113
Cash and cash equivalents at end of year | 84,696 | 187,248 | 107,765
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 3,860 | 5,027 | 6,330
Cash paid for income taxes | 272 | 223 | 190
Supplemental disclosure of noncash investing and financing activities: |  |  |
PPP Loan Forgiveness |  | 4,271 |
Debt issuance costs | 2,760 |  |
Financed insurance | 1,959 |  |
Financed property and equipment | 600 |  |
Financed inventory |  | 4,015 |
Purchases of property and equipment in accounts payable | 2,128 | 2,577 | 3,527
Purchase of intangible assets | 750 |  |
Recognition of lease liability | 1,694 | $ 23,403 |
Modification of lease liability for lease amendment | $ 4,288 |  |
Common stock warrants issued with term loan draw |  |  | 2,974
Common stock issued for partial extinguishment of debt |  |  | $ 33,807

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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