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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (55,993) $ (38,503)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 5,435 4,145
Stock-based compensation expense 10,919 3,410
Reduction of operating lease right-of-use assets 4,755 4,121
Bad debt expense   455
Accrued interest on convertible notes 1,469  
Accretion of debt discounts and issuance costs 1,815  
Other adjustments 5 (184)
Changes in operating assets and liabilities:    
Accounts receivable, net 1,219 4,235
Inventory (7,181) (1,106)
Prepaid expenses and other current assets 1,769 2,356
Other assets (106) (365)
Operating lease liability (3,983) (2,721)
Accounts payable (5,072) (2,206)
Accrued consignor payable (2,569) (19,331)
Other accrued and current liabilities (547) (8,865)
Other noncurrent liabilities 257 (412)
Net cash used in operating activities (47,808) (54,971)
Cash flow from investing activities:    
Purchases of short-term investments   (73,280)
Proceeds from maturities of short-term investments 4,000 114,020
Capitalized proprietary software development costs (2,405) (1,480)
Purchases of property and equipment (5,925) (6,486)
Net cash provided by (used in) investing activities (4,330) 32,774
Cash flow from financing activities:    
Proceeds from issuance of 2028 convertible senior notes, net of issuance costs 278,844  
Purchase of capped calls (33,666)  
Proceeds from exercise of stock options 3,973 2,564
Taxes paid related to restricted stock vesting   (151)
Net cash provided by financing activities 249,151 2,413
Net increase (decrease) in cash, cash equivalents and restricted cash 197,013 (19,784)
Cash, cash equivalents, and restricted cash    
Beginning of period 350,846 154,446
End of period 547,859 134,662
Supplemental disclosures of cash flow information    
Cash paid for interest 7 4
Supplemental disclosures of non-cash investing and financing activities    
Property and equipment additions not yet paid in cash 2,434 2,266
Capitalized proprietary software development costs additions not yet paid in cash 430 756
Issuance costs associated with issuance of 2025 and 2028 convertible senior notes included in other accrued and current liabilities 1,173  
Stock-based compensation capitalized to proprietary software development costs $ 359 $ 0