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CONSOLIDATED STATEMENTS OF CASH FLOWS
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Cash flows from operating activities:        
Net income (loss) ¥ 85,424 $ 12,303 ¥ 22,621 ¥ (59,814)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Allowance for doubtful accounts 510 73 262 388
Inventory write-down 38,759 5,582 21,125 12,497
Share-based compensation 34,185 4,924 25,195 84,963
Depreciation and amortization 35,880 5,168 23,145 13,252
Deferred income tax 1,483 214 (13,815)
Loss on disposal of property and equipment 906 130 880 271
Gain on disposal of investment (9,674)
Share of loss in equity method investment 10,236
Exchange (gain) loss (320) (46) 124 2,650
Changes in operating assets and liabilities:        
Accounts receivable (260,545) (37,526) (135,542) (123,456)
Inventories (16,483) (2,374) (112,494) (122,128)
Advances to suppliers (40,589) (5,846) 15,072 (10,671)
Prepayments and other current assets (1,879) (271) (70,832) (16,866)
Amounts due from related parties (1,207) (174) (22,416) (8,023)
Other non-current assets (1,062) (153) (11,389) (994)
Accounts payable 65,352 9,413 170,486 126,561
Notes payable 84,052 12,106 1,088 17,000
Income tax payables 8,018 1,155 5,597 1,889
Accrued expenses and other current liabilities (19,043) (2,742) 82,533 15,993
Net cash provided by (used in) operating activities 13,441 1,936 2,202 (66,488)
Cash flows from investing activities:        
Purchases of property and equipment (76,114) (10,963) (46,470) (19,760)
Purchase of short term investment (50,000)
Disposal of short term investment 10,000 1,440
Additions of intangible assets (16,077) (2,316) (11,991) (9,331)
Investment in cost method investees (6,750) (972) (7,682)
Payment for an equity method investee 0 (10,562)
Cash disposed upon deconsolidation of a subsidiary (26,240) (3,779)
Consideration of partial disposal of equity method investment 10,000
Increase in restricted cash (2,688) (387) (10,244) (1,900)
Loan to a cost method investee (1,560) (225)
Cash acquired upon consolidation of VIE 446
Net cash used in investing activities (119,429) (17,202) (126,949) (30,545)
Cash flows from financing activities:        
Proceeds from issuance of ordinary shares upon public offering 253,678 36,537 784,350
Payment for public offering costs (15,644) (2,253) (77,289) (2,128)
Proceeds from short-term borrowings 160,000
Repayments of short-term borrowings (160,000)
Proceeds from amounts due to related parties 68,941
Capital contribution from noncontrolling interests 14,063 2,026 0 0
Repayment of amounts due to related parties (61,472)
Proceeds from shareholders’ payment for ordinary shares 17
Proceeds from issuance of convertible redeemable preferred shares 145,746
Proceeds from exercises of share options 3,943 568 161
Payment for ordinary shares repurchase (45,321) (6,528) (13,958)
Advances for ordinary shares repurchase (5,521)
Net cash provided by financing activities 210,719 30,350 687,743 151,104
Net increase in cash and cash equivalents 104,731 15,084 562,996 54,071
Cash and cash equivalents, beginning of year 787,257 113,389 206,391 154,156
Effect of exchange rate changes on cash and cash equivalents 25,331 3,648 17,870 (1,836)
Cash and cash equivalents, end of year 917,319 132,121 787,257 206,391
Supplemental disclosure of cash flow information:        
Cash paid for interest 1,552
Cash paid for income tax 7,330 1,056 2,196 23
Supplemental disclosures of non-cash financing activities:        
Unpaid public offering costs ¥ 8,562 $ 1,234 ¥ 1,545