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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |  |
Net loss | $ (181,377) | $ (145,510) | $ (23,605)
Adjustment to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 11,133 | 1,609 | 711
Stock-based compensation | 60,331 | 23,757 | 1,237
Accretion of unamortized debt discount and amortization of debt issuance costs | 149 | 558 | 2,139
Change in fair value | 0 | 21,463 | (3,649)
Impairment charges | 634 | 3,573 | 0
Deferred income taxes | (19,233) | 0 | 0
Change in fair value of common stock warrant liabilities | (87,922) | 23,049 | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | 203 | 0 | 0
Prepaid expenses and other assets | (6,284) | (7,505) | (4,307)
Operating lease right-of-use assets | (14,511) |  |
Accounts payable | 6,261 | 10,729 | (54)
Accrued professional fees | (3,739) | 0 | 0
Loss contingency accrual | 11,557 | 0 | 0
Operating lease liabilities | 15,677 |  |
Other accruals and liabilities | 26,967 | 12,045 | 5,591
Net cash used in operating activities | (180,154) | (56,232) | (21,937)
Investing Activities |  |  |
Purchases of property and equipment, including internal-use software | (3,236) | (3,246) | (3,223)
Investment in non-marketable equity securities | (54,769) | 0 | 0
Purchases of marketable securities | (504,032) | 0 | 0
Proceeds from sales of marketable securities | 2,100 | 0 | 0
Cash paid for business acquisition, net of cash acquired | (83,987) | 0 | 0
Net cash used in investing activities | (643,924) | (3,246) | (3,223)
Financing Activities |  |  |
Principal payments on finance leases obligations | (1,582) |  |
Borrowings under debt agreements, net of issuance costs | 280,897 | 0 | 9,563
Payments for debt issuance costs | (3) | (201) | 0
Payments under debt agreements | 0 | (10,000) | (3,500)
Proceeds from issuance of common stock in follow-on offering, net of underwriting commissions, and offering costs | 402,138 | 0 | 0
Net cash contributions from Business Combination and PIPE Financing | 0 | 246,484 | 0
Payments made towards offering costs | (13,222) | (1,993) | 0
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs | 0 | 76,617 | 24,908
Net proceeds from exercise of stock options and issuance of common stock | 3,883 | 1,243 | 197
Proceeds from exercise of common stock warrants, net of redemptions | 130,571 | 382 | 0
Taxes paid related to net share settlement of equity awards | 0 | (13,404) | 0
Payments made to repurchase common stock | 0 | (1,339) | 0
Payments for redemption of preferred stock | 0 | (1,211) | 0
Net cash provided by financing activities | 802,682 | 296,578 | 31,168
Net change in cash, cash equivalents and restricted cash | (21,396) | 237,100 | 6,008
Cash, cash equivalents and restricted cash – beginning of year | 265,648 | 28,548 | 22,540
Cash, cash equivalents and restricted cash – end of year | 244,252 | 265,648 | 28,548
Cash paid during the period for: |  |  |
Interest | 180 | 815 | 269
Noncash investing and financing activities: |  |  |
Carrying value of long-term debt and accrued interest converted to redeemable convertible preferred stock | 0 | 0 | 14,852
Settlement of the Redeemable convertible Series E preferred stock forward contract liability | 0 | 21,688 | 0
Deferred offering costs and issuance costs in accounts payable and accrued liabilities | 2,004 | 14,065 | 0
Issuance of common stock for business combination | 67,051 | 0 | 0
Warrant liability reclassified to additional paid-in capital | 84,016 | 0 | 0
Payment of promissory notes through surrender of shares | $ 0 | $ 18,673 | $ 0

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