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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 | $ (169,142) | $ (74,617) | $ (81,452)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Stock-based compensation | 70,844 | 10,124 | 9,889
Depreciation and amortization | 10,607 | 3,993 | 4,764
Amortization of deferred contract costs | 5,030 | 3,648 | 2,266
Amortization of debt discount and issuance costs | 1,390 | 0 | 0
Interest on discount on convertible note | 0 | 0 | 1,248
Amortization of operating lease right-of-use assets | 3,207 | 2,354 | 0
Release of valuation allowance and change in deferred taxes | (39,311) | 0 | 0
Other | 2,944 | 719 | 288
Changes in operating assets and liabilities: |  |  |
Trade and other receivables | (5,839) | (12,171) | 301
Prepaid expenses and other assets, current and non-current | (13,929) | (6,539) | (7,133)
Deferred contract costs, non-current | 1,236 | (2,042) | (845)
Accounts payable | 1,558 | 293 | 2,583
Deferred revenue | (5,554) | 1,226 | 5,727
Accrued compensation | 5,588 | 5,725 | 2,273
Operating lease liabilities | (3,200) | (2,573) | 0
Other liabilities, current and non-current | 7,067 | 4,847 | 1,152
Net cash used in operating activities | (127,504) | (65,013) | (58,939)
Investing activities |  |  |
Purchases of marketable securities | (351,583) | (173,965) | (150,744)
Sales of marketable securities | 0 | 36,746 | 3,498
Maturities of marketable securities | 125,075 | 130,624 | 82,353
Purchases of property and equipment | (1,734) | (1,313) | (580)
Investment in non-marketable equity securities | (2,500) | 0 | 0
Investment in note receivable | (3,000) | 0 | 0
Acquisition of Title365, net of cash acquired | (400,014) | 0 | 0
Capitalization of internal-use software | (152) | 0 | 0
Purchases of intangible assets | 0 | (9) | (40)
Net cash used in investing activities | (633,908) | (7,917) | (65,513)
Financing activities |  |  |
Proceeds from initial public offering, net of underwriters' fees and issuance costs | 366,805 | 0 | 0
Proceeds from debt financing, net of issuance costs | 218,792 | 0 | 0
Repurchases of unvested early exercised stock options | (131) | (18) | (52)
Proceeds from exercises of stock options, including early exercises | 25,353 | 4,527 | 1,648
Proceeds from exercises of common stock warrants | 0 | 10,000 | 0
Proceeds from issuance of Convertible Preferred Stock, net of issuance costs | 309,701 | 76,247 | 124,647
Proceeds from exercises of Convertible Preferred Stock warrants | 10,172 | 0 | 0
Proceeds from repayment of employee promissory note collateralized by common stock | 2,881 | 0 | 0
Proceeds from convertible debt | 0 | 0 | 4,990
Proceeds from exercises of Series D Convertible Preferred Stock warrants | 0 | 0 | 1,500
Other | 0 | 0 | (67)
Net cash provided by financing activities | 933,573 | 90,756 | 132,666
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | (9) | 0 | 0
Net increase in cash, cash equivalents, and restricted cash | 172,152 | 17,826 | 8,214
Cash, cash equivalents, and restricted cash at beginning of period | 46,288 | 28,462 | 20,248
Cash, cash equivalents, and restricted cash at end of period | 218,440 | 46,288 | 28,462
Reconciliation of cash, cash equivalents, and restricted cash within the consolidated balance sheets: |  |  |
Cash and cash equivalents | 213,082 | 41,092 | 22,646
Restricted cash | 5,358 | 5,196 | 5,816
Total cash, cash equivalents, and restricted cash | 218,440 | 46,288 | 28,462
Supplemental disclosure of cash flow information: |  |  |
Cash paid for income taxes | 884 | 26 | 8
Cash paid for interest | 6,428 | 0 | 0
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Vesting of early exercised stock options | 5,023 | 210 | 597
Non-cash additions to property and equipment | 0 | 1,347 | 0
Operating lease liabilities arising from obtaining new or modified right-of-use assets | 1,715 | 1,398 | 0
Accretion adjustments of redeemable noncontrolling interest to redemption value | 1,430 | 0 | 0
Issuance of warrant in connection with debt financing | 6,789 | 0 | 0
Exercise of Series D Convertible Preferred Stock warrants included in prepaid expenses and other current assets | $ 0 | $ 2,158 | $ 0

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