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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable, net and Revenue recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Revenue recognition |  |  |
Revenues | $ 224,315 | $ 255,287 | $ 629,428
Return period, subsequent to the receipt of shipment with quality-related issues | 12 months |  |
Provisions for sales return | $ 9,104 | 7,154 | 15,732
Cost of goods sold | 78,439 | 101,795 | 269,496
Movements in the allowance for credit losses |  |  |
Allowance of credit losses | 1,858 | 1,853 |
Credit losses recognized | 0 | 19 | 0
Revenue included in advance from customers |  |  |
Contract liabilities as of January 1 | 6,625 | 11,201 |
Cash received in advance, net of VAT | 190,902 | 236,087 |
Revenue recognized from opening balance of contract liabilities | (6,625) | (11,201) |
Revenue recognized from contract liabilities arising during current year | (181,980) | (229,462) |
Contract liabilities as of December 31 | $ 8,922 | 6,625 | 11,201
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] | true |  |
Selling and marketing |  |  |
Advertising expense | $ 96,797 | 104,347 | 291,702
General and administrative |  |  |
Research and development expense | 10,270 | 15,527 | 19,105
Chargeback incurred | $ 758 | 681 | 2,338
Income taxes |  |  |
Threshold percentage for not recognizing income tax | 50.00% |  |
Shipping and handling |  |  |
Revenue recognition |  |  |
Cost of goods sold | $ 36,124 | 48,625 | 126,628
Membership revenues |  |  |
Revenue recognition |  |  |
Revenues | 220 | 1,254 | $ 1,899
Foreign currency risk | Denominated in RMB |  |  |
Foreign currency risk |  |  |
Cash and cash equivalents and restricted cash | $ 1,046 | $ 1,638 |
Maximum |  |  |
Revenue recognition |  |  |
Return period, subsequent to the receipt of shipment with no quality-related issues | 7 days |  |
Return period, subsequent to the receipt of shipment with quality-related issues | 30 days |  |

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