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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (82,500) $ (57,412)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 7,821 6,364
Stock-based compensation expense 8,991 12,514
Reduction of operating lease right-of-use assets 5,172 4,797
Bad debt expense 651 193
Accrued interest on convertible notes 575 575
Accretion of debt discounts and issuance costs 633 641
Loss on disposal of property and equipment and impairment of capitalized proprietary software 36 175
Property, plant, equipment, and right-of-use asset impairments 32,891 0
Provision for inventory write-downs and shrinkage 3,446 1,809
Changes in operating assets and liabilities:    
Accounts receivable, net 2,615 (602)
Inventory, net 8,678 (4,492)
Prepaid expenses and other current assets (1,139) (426)
Other assets (461) (779)
Operating lease liability (6,158) (3,655)
Accounts payable (1,385) 2,030
Accrued consignor payable (9,429) (2,389)
Other accrued and current liabilities (894) (8,627)
Other noncurrent liabilities 24 (70)
Net cash used in operating activities (30,433) (49,354)
Cash flow from investing activities:    
Capitalized proprietary software development costs (4,214) (3,304)
Purchases of property and equipment (11,706) (5,143)
Net cash used in investing activities (15,920) (8,447)
Cash flow from financing activities:    
Proceeds from exercise of stock options 0 637
Taxes paid related to restricted stock vesting (295) 0
Net cash (used in) provided by financing activities (295) 637
Net decrease in cash and cash equivalents (46,648) (57,164)
Cash and cash equivalents    
Beginning of period 293,793 418,171
End of period 247,145 361,007
Supplemental disclosures of cash flow information    
Cash paid for interest 1,458 1,448
Cash paid for income taxes 4 3
Supplemental disclosures of non-cash investing and financing activities    
Property and equipment additions not yet paid in cash 1,906 718
Capitalized proprietary software development costs additions not yet paid in cash 1,279 1,838
Stock-based compensation capitalized to proprietary software development costs $ 290 $ 450