| Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 |
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Cash and cash equivalents | 70 | 150 | 102 | 98 | 24 |
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Restricted cash | 8 | 13 | 35 | 13 | 2 |
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Accounts receivable, net | 8 | 17 | 18 | 15 | 2 |
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Inventories | 183 | 249 | 385 | 504 | 470 |
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Prepaid Supplies | 8 | 62 | 48 | 61 | 55 |
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Prepayments and other current assets, net | 4 | 19 | 62 | 76 | 94 |
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Total current assets | 326 | 527 | 649 | 767 | 648 |
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Property and equipment, net | 6 | 8 | 12 | 11 | 6 |
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Restricted cash | 19 | 0 | 1 | 1 | 0 |
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Equity Method Investments | - | 0 | 10 | 9 | 4 |
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Deferred tax assets | - | - | 15 | 13 | 38 |
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Goodwill | - | 3 | 3 | 0 | 0 |
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Operating lease right-of-use assets | - | - | 23 | 16 | 3 |
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Other non-current assets | 1 | 3 | 2 | 2 | 1 |
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Total non-current assets | 33 | 24 | 68 | 51 | 54 |
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Total assets | 359 | 552 | 718 | 819 | 702 |
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Short-term borrowings and current portion of long-term borrowings | 27 | 20 | 23 | 29 | 5 |
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Accounts payable | 49 | 73 | 82 | 53 | 64 |
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Amounts due to related parties | 0 | 0 | 0 | 0 | - |
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Advances from customers | - | 10 | 8 | 15 | 31 |
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Income tax payable | - | - | 16 | 12 | 6 |
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Accrued expenses and other current liabilities | 53 | 51 | 129 | 114 | 98 |
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Deferred revenue | - | 9 | 14 | 34 | 3 |
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Operating lease liabilities | - | - | 6 | 6 | 2 |
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Total current liabilities | 142 | 162 | 277 | 263 | 210 |
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Long-term borrowings | 19 | 167 | 175 | 173 | 212 |
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Operating lease liabilities | - | - | 16 | 11 | 1 |
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Long-term liabilities | - | - | - | 17 | - |
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Total non-current liabilities | 19 | 170 | 202 | 200 | 213 |
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Total liabilities | 161 | 332 | 479 | 464 | 422 |
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Redeemable non-controlling interest | 1 | 1 | 1 | 2 | 2 |
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Total mezzanine equity | 1 | 1 | 1 | 2 | 2 |
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Class A ordinary shares | 0 | 0 | 0 | 0 | 0 |
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Class B ordinary shares | 0 | 0 | 0 | 0 | 0 |
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Treasury shares (517,454 Class A ordinary shares as of December 31, 2020 and 2021, at cost) | 7 | 10 | 10 | 11 | 11 |
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Additional paid-in capital | 425 | 413 | 409 | 546 | 558 |
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Accumulated losses | -220 | -186 | -162 | -185 | -278 |
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Accumulated other comprehensive income | -1 | -1 | -4 | 6 | 10 |
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Total equity attributable to ordinary shareholders | 197 | 215 | 233 | 355 | 279 |
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Nonredeemable Noncontrolling Interest | 0 | 3 | 4 | -2 | -2 |
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Class A ordinary shares | 0 | 0 | 0 | 0 | 0 |
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Class B ordinary shares | 0 | 0 | 0 | 0 | 0 |
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Total Shareholders' Equity | 197 | 218 | 237 | 354 | 278 |
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Total liabilities, mezzanine equity and shareholders' equity | 359 | 552 | 718 | 819 | 702 |
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