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CONSOLIDATED BALANCE SHEETS (Parentheticals) ¥ in Thousands, $ in Thousands | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) ¥ / shares shares | Dec. 31, 2017 $ / shares
--- | --- | --- | --- | ---
Accounts payable | ¥ 6,996 | $ 1,018 | ¥ 3,340 |
Advance from customers | 14,704 | 2,139 | 9,751 |
Short-term borrowings | ¥ | 0 |  | 24,971 |
Salary and welfare benefits payable | 48,835 | 7,103 | 41,297 |
Other taxes payable | 16,974 | 2,469 | 21,476 |
Other current liabilities | ¥ 36,426 | $ 5,296 | 29,047 |
Convertible loans | ¥ |  |  | ¥ 41,165 |
Pre-IPO China Best Reach Co., Limited ("China Best") redeemable shares |  |  |  |
Mezzanine equity, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | $ 0.0001
Mezzanine equity, authorized shares | 0 | 0 | 5,660,000 |
Mezzanine equity, shares issued | 0 | 0 | 5,660,000 |
Mezzanine equity, shares outstanding | 0 | 0 | 5,660,000 |
Mezzanine equity, redemption value per share | ¥ / shares |  |  | ¥ 0.45 |
Mezzanine equity, liquidation value | ¥ / shares |  |  | ¥ 0.23 |
Pre-IPO Series A convertible redeemable preferred shares |  |  |  |
Mezzanine equity, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | 0.0001
Mezzanine equity, authorized shares | 0 | 0 | 19,798,750 |
Mezzanine equity, shares issued | 0 | 0 | 19,798,750 |
Mezzanine equity, shares outstanding | 0 | 0 | 19,798,750 |
Mezzanine equity, redemption value per share | ¥ / shares |  |  | ¥ 0.45 |
Mezzanine equity, liquidation value | ¥ / shares |  |  | ¥ 0.23 |
Pre-IPO Series B-1 convertible redeemable preferred shares |  |  |  |
Mezzanine equity, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | 0.0001
Mezzanine equity, authorized shares | 0 | 0 | 12,428,343 |
Mezzanine equity, shares issued | 0 | 0 | 12,428,343 |
Mezzanine equity, shares outstanding | 0 | 0 | 12,428,343 |
Mezzanine equity, redemption value per share | ¥ / shares |  |  | ¥ 0.56 |
Mezzanine equity, liquidation value | ¥ / shares |  |  | ¥ 0.30 |
Pre-IPO Series B-2 convertible redeemable preferred shares |  |  |  |
Mezzanine equity, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | 0.0001
Mezzanine equity, authorized shares | 0 | 0 | 22,742,215 |
Mezzanine equity, shares issued | 0 | 0 | 22,742,215 |
Mezzanine equity, shares outstanding | 0 | 0 | 22,742,215 |
Mezzanine equity, redemption value per share | ¥ / shares |  |  | ¥ 2.69 |
Mezzanine equity, liquidation value | ¥ / shares |  |  | ¥ 1.44 |
Pre-IPO Series C-1 convertible redeemable preferred shares |  |  |  |
Mezzanine equity, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | 0.0001
Mezzanine equity, authorized shares | 0 | 0 | 3,427,812 |
Mezzanine equity, shares issued | 0 | 0 | 3,427,812 |
Mezzanine equity, shares outstanding | 0 | 0 | 3,427,812 |
Mezzanine equity, redemption value per share | ¥ / shares |  |  | ¥ 6.98 |
Mezzanine equity, liquidation value | ¥ / shares |  |  | ¥ 3.81 |
Pre-IPO Series C-2 convertible redeemable preferred shares |  |  |  |
Mezzanine equity, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | 0.0001
Mezzanine equity, authorized shares | 0 | 0 | 33,408,715 |
Mezzanine equity, shares issued | 0 | 0 | 33,408,715 |
Mezzanine equity, shares outstanding | 0 | 0 | 33,408,715 |
Mezzanine equity, redemption value per share | ¥ / shares |  |  | ¥ 7.76 |
Mezzanine equity, liquidation value | ¥ / shares |  |  | ¥ 4.24 |
Pre-IPO Series C+ convertible redeemable preferred shares |  |  |  |
Mezzanine equity, par value per share (in dollars per share) | $ / shares |  |  |  | 0.0001
Mezzanine equity, authorized shares | 0 | 0 | 18,855,298 |
Mezzanine equity, shares issued | 0 | 0 | 18,855,298 |
Mezzanine equity, shares outstanding | 0 | 0 | 18,855,298 |
Mezzanine equity, redemption value per share | ¥ / shares |  |  | ¥ 6.62 |
Mezzanine equity, liquidation value | ¥ / shares |  |  | ¥ 4.51 |
Pre-IPO Class A ordinary shares |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  |  |  | 0.0001
Common stock, shares authorized | 0 | 0 | 328,418,287 |
Common stock, shares issued | 0 | 0 | 39,610,000 |
Common stock, shares outstanding | 0 | 0 | 39,610,000 |
Class A ordinary shares |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | 0.0001
Common stock, shares authorized | 800,000,000 | 800,000,000 | 0 |
Common stock, shares issued | 259,836,223 | 259,836,223 | 0 |
Common stock, shares outstanding | 234,030,828 | 234,030,828 | 0 |
Class B ordinary shares |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  | $ 0.0001 |  | $ 0.0001
Common stock, shares authorized | 60,000,000 | 60,000,000 | 55,260,580 |
Common stock, shares issued | 55,260,580 | 55,260,580 | 55,260,580 |
Common stock, shares outstanding | 55,260,580 | 55,260,580 | 55,260,580 |
Consolidated VIEs without recourse to primary beneficiary |  |  |  |
Accounts payable | ¥ | ¥ 1,871 |  | ¥ 3,340 |
Advance from customers | ¥ | 13,922 |  | 9,751 |
Short-term borrowings | ¥ | 0 |  | 24,971 |
Salary and welfare benefits payable | ¥ | 30,535 |  | 40,803 |
Other taxes payable | ¥ | 12,651 |  | 21,476 |
Other current liabilities | ¥ | 5,306 |  | 26,422 |
Convertible loans | ¥ |  |  |  |
Long-term borrowings | ¥ | ¥ 0 |  | ¥ 2,932 |

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