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CONSOLIDATED BALANCE SHEETS (Parentheticals) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2019 $ / shares | Dec. 31, 2019 CNY (¥) shares
--- | --- | --- | --- | ---
Accounts payable | $ 3,340 | ¥ 21,794 |  | ¥ 5,825
Advance from customers | 3,290 | 21,466 |  | 4,805
Salary and welfare benefits payable | 8,888 | 57,996 |  | 68,025
Other taxes payable | 3,524 | 22,992 |  | 22,494
Current portion of deferred revenue | 621 | 4,054 |  |
Short-term operating lease liabilities | 906 | 5,911 |  |
Guarantee liabilities | 59 | 387 |  |
Other current liabilities | 6,370 | 41,564 |  | 40,913
Non-current portion of deferred revenue | 28 | 185 |  |
Deferred tax liability | 835 | 5,451 |  |
Long-term operating lease liabilities | 620 | 4,048 |  |
Other non-current liabilities | $ 230 | 1,498 |  | 2,158
Major VIEs |  |  |  |
Accounts payable |  | 3,827 |  | 3,624
Advance from customers |  | 4,649 |  | 2,677
Salary and welfare benefits payable |  | 31,115 |  | 29,970
Other taxes payable |  | 12,860 |  | 12,412
Current portion of deferred revenue |  | 4,054 |  | 0
Short-term operating lease liabilities |  | 1,025 |  | 0
Guarantee liabilities |  | 0 |  | 0
Other current liabilities |  | 8,795 |  | 800
Non-current portion of deferred revenue |  | 185 |  | 0
Deferred tax liability |  | 0 |  | 0
Long-term operating lease liabilities |  | 978 |  | 0
Other non-current liabilities |  | ¥ 0 |  | ¥ 0
Class A ordinary shares |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares | $ 0.0001 |  | $ 0.0001 |
Common stock, shares authorized | shares | 800,000,000 | 800,000,000 |  | 800,000,000
Common stock, shares issued | shares | 268,202,667 | 268,202,667 |  | 259,836,223
Common stock, shares outstanding | shares | 250,477,368 | 250,477,368 |  | 239,031,946
Class B ordinary shares |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares | $ 0.0001 |  | $ 0.0001 |
Common stock, shares authorized | shares | 60,000,000 | 60,000,000 |  | 60,000,000
Common stock, shares issued | shares | 55,260,580 | 55,260,580 |  | 55,260,580
Common stock, shares outstanding | shares | 55,260,580 | 55,260,580 |  | 55,260,580

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