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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 | $ (657,939) | $ (1,743,751) | $ (418,259)
Reconciliation of net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 29,054 | 12,661 | 4,885
Right-of-use assets expensed, net of credits received | 18,104 | 144,433 | 245,861
Non-cash stock-based compensation | 130,300 | 183,626 | 128,035
Provision for excess and obsolete inventory | 447,597 | 0 | 0
Other items, net | (21,903) | (7,641) | (15,080)
Changes in operating assets and liabilities: |  |  |
Inventory | (477,801) | (8,872) | 0
Accounts receivable, prepaid expenses, and other assets | 249,166 | (183,393) | (422,689)
Accounts payable, accrued expenses, and other liabilities | 913,399 | 600,326 | 163,161
Deferred revenue | (1,045,914) | 1,325,557 | 271,545
Net cash provided by (used in) operating activities | (415,937) | 322,946 | (42,541)
Investing Activities: |  |  |
Capital expenditures | (89,056) | (54,501) | (54,473)
Internal-use software | (3,929) | (2,985) | (149)
Acquisition of Novavax CZ, net of cash acquired | 0 | 0 | (165,516)
Purchases of marketable securities | 0 | (2,167) | (363,202)
Proceeds from maturities of marketable securities | 0 | 159,807 | 205,562
Net cash provided by (used in) investing activities | (92,985) | 100,154 | (377,778)
Financing Activities: |  |  |
Net proceeds from sale of preferred stock | 0 | 0 | 199,822
Net proceeds from sales of common stock | 249,230 | 564,859 | 875,623
Proceeds from issuance of convertible notes | 175,250 | 0 | 0
Payments of costs related to issuance of convertible notes | (5,258) | 0 | 0
Net proceeds from the exercise of stock-based awards | (639) | 24,761 | 5,382
Finance lease payments | (93,595) | (127,907) | (96,065)
Net cash provided by financing activities | 324,988 | 461,713 | 984,762
Effect of exchange rate on cash, cash equivalents, and restricted cash | 4,520 | (5,292) | 2,115
Net increase in cash, cash equivalents, and restricted cash | (179,414) | 879,521 | 566,558
Cash, cash equivalents, and restricted cash at beginning of year | 1,528,259 | 648,738 | 82,180
Cash, cash equivalents, and restricted cash at end of year | 1,348,845 | 1,528,259 | 648,738
Supplemental disclosure of non-cash activities: |  |  |
Sale of common stock under the Sales Agreement not settled at year-end | 0 | 0 | 3,227
Capital expenditures included in accounts payable and accrued expenses | 17,665 | 10,338 | 9,255
Right-of-use assets from new lease agreements | 91,855 | 179,210 | 247,599
Supplemental disclosure of cash flow information: |  |  |
Cash interest payments, net of amounts capitalized | 18,035 | 19,428 | 13,705
Cash paid for income taxes | $ 17,980 | $ 12,606 | $ 0

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