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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |  |
Net loss | $ (202,799) | $ (142,978) | $ (85,178)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 4,654 | 6,157 | 6,932
Amortization of debt issuance costs | 938 | 357 | 279
Loss on extinguishment of debt |  | 1,031 |
Stock-based compensation expense | 13,254 | 2,756 | 1,158
Loss on disposal of property and equipment | 46 | 789 | 3,198
Provision for inventory obsolescence | 6,588 | 2,682 | (1,069)
Revaluation of preferred stock warrant | 20,470 | 769 | 174
Other | 2,329 | 789 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (32,068) | (18,430) | 9,049
Inventory | (224,489) | (92,877) | 11,902
Prepaid expenses and other current assets | (9,117) | (3,935) | (2,916)
Other assets | (4,556) | (3,487) | (3,105)
Accounts payable | 14,066 | 4,035 | (6,527)
Accrued expenses | 28,431 | 10,131 | 6,291
Deferred revenue | 7,499 | 10,902 | 860
Other liabilities | 19,500 | 5,673 | (5,959)
Net cash used in operating activities | (355,254) | (215,636) | (64,911)
Investing activities |  |  |
Purchase of property and equipment | (11,329) | (3,528) | (2,062)
Proceeds from the sale of property and equipment |  |  | 14,850
Net cash (used in) provided by investing activities | (11,329) | (3,528) | 12,788
Financing activities |  |  |
Repayments of long-term debt |  | (25,000) | (5,506)
Payments of debt extinguishment costs |  | (685) |
Proceeds from vehicle floorplan | 1,242,736 | 992,179 | 648,309
Repayments of vehicle floorplan | (1,086,966) | (914,200) | (656,194)
Payment of vehicle floorplan upfront commitment fees | (2,906) |  |
Proceeds from the issuance of redeemable convertible preferred stock, net | 21,694 | 227,502 | 145,899
Repurchase of common stock | (1,818) | (5,824) |
Common stock shares withheld to satisfy employee tax withholding obligations | (2,915) |  |
Proceeds from the issuance of common stock in connection with IPO, net of underwriting discount | 504,024 |  |
Payments of costs related to IPO | (6,791) | (723) |
Proceeds from the issuance of common stock in connection with follow-on public offering, net of underwriting discount | 569,471 |  |
Payments of costs related to follow-on public offering | (1,519) |  |
Proceeds from exercise of stock options | 2,341 | 1,810 | 31
Other financing activities | (316) | 183 | (164)
Net cash provided by financing activities | 1,237,035 | 275,242 | 132,375
Net increase in cash, cash equivalents and restricted cash | 870,452 | 56,078 | 80,252
Cash, cash equivalents and restricted cash at the beginning of period | 219,587 | 163,509 | 83,257
Cash, cash equivalents and restricted cash at the end of period | 1,090,039 | 219,587 | 163,509
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 8,540 | 12,607 | 7,743
Cash paid for income taxes | 163 | 157 | 212
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Accretion of redeemable convertible preferred stock |  | 132,750 | $ 13,036
Series H preferred stock issuance costs included in accrued expenses |  | 5,020 |
Conversion of redeemable convertible preferred stock warrant to common stock warrant | 21,873 |  |
Issuance of common stock as upfront payment to nonemployee | 2,127 |  |
Accrued property and equipment expenditures | $ 97 | 200 |
IPO |  |  |
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Costs related to IPO included in accrued expenses and accounts payable |  | $ 1,703 |

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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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