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CONSOLIDATED STATEMENTS OF CASH FLOWS ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Cash flows from operating activities |  |  |  |
Net income | ¥ 88,891 | $ 13,949 | ¥ 174,446 | ¥ 293,830
Adjustment to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization | 72,148 | 11,322 | 54,271 | 23,577
Inventory write-down | 8,103 | 1,272 | 22,577 | 15,661
Share-based compensation | 47,405 | 7,439 | 72,203 | 43,168
Allowance for doubtful accounts | 25,541 | 4,008 | 4,484 | 2,006
Loss from disposal of property and equipment | 0 |  |  | 29
Deferred income tax benefits | (21,115) | (3,313) | (1,492) | (7,042)
Investment income | (1,369) | (215) | (10,800) | (4,654)
Changes in operating assets and liabilities: |  |  |  |
Accounts and notes receivable from third parties | 99,877 | 15,673 | (118,403) | (206,477)
Accounts receivable from a related party | 287,690 | 45,145 | 98,792 | (446,963)
Inventories | (145,079) | (22,766) | (43,937) | (201,701)
Prepaid expenses and other current assets | (76,193) | (11,956) | (23,543) | (25,659)
Other receivables from related parties | (266) | (42) | (64,103) | 88,376
Amounts due to related parties | (118,777) | (18,639) | 99,086 | 19,343
Interest received relating to the investment income recognized in previous year | 2,785 | 437 | 8,089 | 361
Accounts and notes payable | 67,737 | 10,629 | (41,788) | 494,678
Advances from customers | (12,981) | (2,037) | 9,463 | 16,838
Income tax payables | (7,619) | (1,196) | 17,440 | 23,323
Accrued expenses and other liabilities | 3,202 | 503 | 421 | 122,550
Lease liabilities | (11,012) | (1,728) | (8,392) | (5,760)
Purchase of a land use right | 0 |  | (63,618) |
Net cash provided by operating activities | 308,968 | 48,485 | 185,196 | 245,484
Cash flows from investing activities |  |  |  |
Purchase of equipment | (99,448) | (15,606) | (47,509) | (56,131)
Purchase of lease hold improvement | (3,991) | (626) | (569) | (7,874)
Purchase of intangible assets | (6,733) | (1,057) | (2,365) | (4,595)
Purchase of short-term investments | (1,796,620) | (281,929) | (3,256,151) | (812,086)
Maturity of short-term investments | 1,663,489 | 261,038 | 2,874,162 | 670,190
Placement of short-term deposits | (164,761) | (25,855) | (215,630) | (270,457)
Maturities of short-term deposits | 162,743 | 25,538 | 214,979 | 211,967
Placement of long-term deposits | (30,000) | (4,708) |  |
Maturities of long-term deposits | 10,000 | 1,569 |  |
Proceeds from disposal of property and equipment | 0 |  |  | 30
Net cash used in investing activities | (265,321) | (41,636) | (433,083) | (268,956)
Cash flows from financing activities |  |  |  |
Dividend paid | 0 |  |  | (46,602)
Proceeds from exercise of vested share options | 12,920 | 2,027 | 6,615 | 1,109
Receipt (repayment) of borrowing | 16,106 | 2,527 | (95,868) | 95,868
Cash paid in relation to issuance of ordinary shares upon IPO | 0 |  |  | (2,637)
Capital injection in subsidiaries from non-controlling shareholders or investors | 175 | 27 |  | 3,000
Purchase of non-controlling interests | 0 |  | (1,286) | (2,196)
Repurchase of ordinary shares | (12,068) | (1,894) | (54,600) |
Dividends paid by non-wholly owned subsidiaries to non-controlling interests | 0 |  | (1,236) |
Net cash provided by (used in) financing activities | 17,133 | 2,687 | (146,375) | 48,542
Effect of exchange rate changes on cash and cash equivalents | (12,703) | (1,993) | (34,034) | 8,087
Net increase (decrease) in cash and cash equivalents and restricted cash | 48,077 | 7,543 | (428,296) | 33,157
Cash and cash equivalents and restricted cash at the beginning of the year | 574,709 | 90,186 | 1,003,005 | 969,848
Cash and cash equivalents and restricted cash at the end of the year | 622,786 | 97,729 | 574,709 | 1,003,005
Cash and cash equivalents at the end of the year | 586,955 | 92,106 | 504,108 | 972,438
Restricted cash at the end of the year | 35,831 | 5,623 | 70,601 | 30,567
Supplemental disclosures of cash flow information: |  |  |  |
Cash paid for income tax | (34,446) | (5,405) | (27,373) | (28,909)
Cash paid for interest expense, net of amounts capitalized | 0 |  | (76) | (995)
Acquisition of equipment in form of other payable | ¥ 60,507 | $ 9,495 | ¥ 15,624 | ¥ 5,997

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