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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 | $ (438,875) | $ (187,925) | $ (149,079)
Adjustment to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 17,871 | 11,665 | 1,609
Stock-based compensation | 108,202 | 60,331 | 23,757
Gain on extinguishment of debt | (2,553) | 0 | 0
Accretion of unamortized debt discount and amortization of debt issuance costs | 3,743 | 149 | 558
Fair value adjustment of derivatives | 0 | 0 | 21,463
Amortization of premium for marketable securities | 3,095 | 0 | 0
Impairment charges | 168,051 | 634 | 3,573
Deferred income taxes | (698) | (19,377) | 0
Change in fair value of common stock warrant liabilities | (6,004) | (87,922) | 23,049
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | 5,592 | 931 | 0
Prepaid expenses and other assets | 11,602 | (6,284) | (7,505)
Operating lease right-of-use assets | 1,605 | (14,511) | 0
Accounts payable | (17,222) | 6,261 | 10,729
Loss contingency accrual | (4,449) | 11,557 | 0
Operating lease liabilities | (1,602) | 15,677 | 0
Other accruals and liabilities | (27,955) | 28,660 | 15,614
Net cash used in operating activities | (179,597) | (180,154) | (56,232)
Investing Activities |  |  |
Purchases of property and equipment, including internal use software | (1,892) | (3,236) | (3,246)
Investment in non-marketable equity securities | 0 | (54,769) | 0
Purchases of marketable securities | (454,091) | (504,032) | 0
Proceeds from sales of marketable securities | 167,847 | 2,100 | 0
Proceeds from maturities of marketable securities | 599,522 | 0 | 0
Cash paid for business acquisition, net of cash acquired | 0 | (83,987) | 0
Net cash provided by (used in) investing activities | 311,386 | (643,924) | (3,246)
Financing Activities |  |  |
Principal payments on finance lease liabilities | (2,612) | (1,582) | 0
Borrowings under debt agreements, net of issuance costs | 0 | 280,897 | 0
Payments for debt issuance costs | (2,005) | (3) | (201)
Payments for extinguishment of debt | (7,298) | 0 | 0
Payments under debt agreements | 0 | 0 | (10,000)
Proceeds from issuance of common stock in follow-on offering, net of underwriting commissions, and offering costs | 0 | 402,138 | 0
Net cash contributions from FEAC business combination and PIPE Financing | 0 | 0 | 246,484
Payments made towards offering costs | 0 | (13,222) | (1,993)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs | 0 | 0 | 76,617
Net proceeds from exercise of stock options and issuance of common stock | 1,310 | 3,883 | 1,243
Proceeds from exercise of common stock warrants, net of redemptions | 0 | 130,571 | 382
Taxes paid related to net share settlement of equity awards | 0 | 0 | (13,404)
Payments made to repurchase common stock | 0 | 0 | (1,339)
Payments for redemption of preferred stock | 0 | 0 | (1,211)
Net cash provided by (used in) financing activities | (10,605) | 802,682 | 296,578
Net change in cash, cash equivalents and restricted cash | 121,184 | (21,396) | 237,100
Cash, cash equivalents and restricted cash – beginning of year | 244,252 | 265,648 | 28,548
Cash, cash equivalents and restricted cash – end of year | 365,436 | 244,252 | 265,648
Cash paid during the period for: |  |  |
Interest | 30,334 | 180 | 815
Noncash investing and financing activities: |  |  |
Settlement of the Redeemable convertible Series E preferred stock forward contract liability | 0 | 0 | 21,688
Deferred offering costs in accounts payable and accrued liabilities | 0 | 2,004 | 14,065
Issuance of common stock for business combination | 0 | 67,051 | 0
Warrant liability reclassified to additional paid-in capital | 0 | 84,016 | 0
Payment of promissory notes through surrender of shares | $ 0 | $ 0 | $ 18,673

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