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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net loss | $ (342,801) | $ (229,828) | $ (95,042)
Adjustments to reconcile net loss to cash used in operating activities: |  |  |
Depreciation and amortization | 3,632 | 1,567 | 1,202
Net amortization of premiums or discounts on marketable securities | 2,270 | 1,294 | (787)
Amortization of debt issuance costs | 187 | 0 | 0
Amortization of deferred contract acquisition costs | 26,697 | 16,029 | 8,864
Non-cash operating lease costs | 10,990 | 11,911 | 0
Common stock charitable donation expense | 13,290 | 0 | 0
Stock-based compensation, net of amounts capitalized | 155,624 | 143,341 | 18,617
Deferred income taxes | 1,335 | (1,335) | (394)
Other | 1,828 | 710 | 322
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (32,516) | (41,612) | (27,117)
Deferred contract acquisition costs | (57,924) | (38,129) | (19,671)
Prepaid expenses and other assets | (31,366) | (14,368) | (5,926)
Accounts payable | 6,143 | (327) | 1,511
Accrued expenses and other liabilities | 61,132 | 15,837 | 8,604
Operating lease liabilities | (10,866) | (11,224) | 0
Deferred revenue | 87,285 | 64,077 | 40,983
Net cash used in operating activities | (105,060) | (82,057) | (68,834)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Capitalization of internal-use software costs | (5,342) | (3,610) | (975)
Purchases of marketable securities | (663,595) | (329,616) | (65,978)
Sales of marketable securities | 0 | 4,988 | 33,104
Maturities of marketable securities | 271,942 | 152,419 | 71,144
Purchases of property and equipment | (3,600) | (1,040) | (1,954)
Other | 12 | 0 | 300
Net cash (used in) provided by investing activities | (400,583) | (176,859) | 35,641
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Proceeds from initial public offering, net of underwriting discounts and commissions | 786,600 | 0 | 0
Proceeds from issuance of common stock upon exercise of vested options | 51,737 | 12,376 | 4,467
Proceeds from issuance of common stock upon early exercise of unvested options, net of repurchases | 18,972 | 4,678 | 8,965
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs | 0 | 259,815 | 0
Payments of deferred offering costs | (3,125) | (111) | 0
Debt instrument initial conversion price per share | 1,081,300 | 0 | 0
Payments for purchase of capped calls | (90,970) | 0 | 0
Net cash provided by financing activities | 1,844,514 | 276,758 | 13,432
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | 5 | (7) | (85)
Net increase (decrease) in cash, cash equivalents, and restricted cash | 1,338,876 | 17,835 | (19,846)
Cash, cash equivalents, and restricted cash at beginning of period | 37,806 | 19,971 | 39,817
Cash, cash equivalents, and restricted cash at end of period | 1,376,682 | 37,806 | 19,971
Reconciliation of cash, cash equivalents, and restricted cash within the consolidated balance sheets to the amounts shown above: |  |  |
Cash and cash equivalents | 1,375,932 | 36,789 | 18,954
Restricted cash included in other assets, current and non-current | 750 | 1,017 | 1,017
Total cash, cash equivalents, and restricted cash | 1,376,682 | 37,806 | 19,971
Cash paid for: |  |  |
Income taxes | 2,168 | 960 | 436
Non-cash investing and financing activities: |  |  |
Stock-based compensation capitalized in internal-use software costs | 2,625 | 547 | 69
Right-of-use assets obtained in exchange for new operating lease liabilities | 813 | 0 | 0
Property and equipment included in accounts payable and accrued expenses and other liabilities | 0 | 203 | 60
Issuance of common stock upon exercise of vested options included in prepaid expenses and other current assets | 55 | 54 | 0
Vesting of early exercised stock options | 10,235 | 7,030 | 3,927
Conversion of convertible founder stock for Series E redeemable convertible preferred stock | 0 | 109,035 | 0
Unpaid deferred offering costs | 0 | 36 | 0
Convertible senior notes issuance costs included in accrued expenses and other liabilities | $ 786 | $ 0 | $ 0

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