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Additional Information - Condensed Financial Statements of the Parent Company - Condensed balance sheets (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Current assets:                
Cash and cash equivalents $ 16,845     ¥ 109,916 $ 29,720 ¥ 193,920 ¥ 578,558 ¥ 66,695
Time deposit 7,000     45,674   69,762    
Non-current assets:                
Other non-current assets 48     313   7,577    
Total non-current assets 24,981     163,006   35,811    
Current liabilities:                
Other taxes payable 3,524     22,992   22,494    
Total current liabilities 26,998     176,164   142,062    
Non-current liabilities:                
Other non-current liabilities 230     1,498   2,158    
Total non-current liabilities 1,713     11,182   2,158    
Stockholders' Equity Attributable to Parent [Abstract]                
Treasury stock (7,032)     (45,886)   (46,533)    
Additional paid-in capital 187,177     1,221,339   1,187,577    
Accumulated deficit (135,126)     (881,700)   (718,666)    
Accumulated other comprehensive income/(loss) (890)     (5,805)   1,048    
TOTAL SHAREHOLDERS' EQUITY 44,162     288,164   423,634    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 72,704     474,407   567,195    
Class A ordinary shares                
Stockholders' Equity Attributable to Parent [Abstract]                
Ordinary shares 28     181   173    
Class B ordinary shares                
Stockholders' Equity Attributable to Parent [Abstract]                
Ordinary shares 5     35   35    
Reportable Legal Entities Member | Parent Company [Member]                
Current assets:                
Cash and cash equivalents 7,127     46,501   102,002    
Time deposit 7,000     45,674   69,762    
Prepayment and other current assets (1,977)     (12,897)   104,572    
Receivables due from subsidiaries, VIEs and subsidiaries of VIEs 18,319     119,533   110,348    
Total current assets 30,469     198,811   386,684    
Non-current assets:                
Investments in subsidiaries, VIEs and subsidiaries of VIEs 14,937 ¥ 97,465 ¥ 46,087          
Total non-current assets 14,937     97,465   46,087    
TOTAL ASSETS 45,406     296,276   432,771    
Current liabilities:                
Other taxes payable 954     6,224   6,654    
Other current liabilities 60     390   325    
Total current liabilities 1,014     6,614   6,979    
Non-current liabilities:                
Other non-current liabilities 230     1,498   2,158    
Total non-current liabilities 230     1,498   2,158    
TOTAL LIABILITIES 1,244     8,112   9,137    
Stockholders' Equity Attributable to Parent [Abstract]                
Treasury stock (7,032)     (45,886)   (46,533)    
Additional paid-in capital 187,177     1,221,339   1,187,577    
Accumulated deficit (135,126)     (881,700)   (718,666)    
Accumulated other comprehensive income/(loss) (890)     (5,805)   1,048    
TOTAL SHAREHOLDERS' EQUITY 44,162     288,164   423,634    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 45,406     296,276   432,771    
Reportable Legal Entities Member | Class A ordinary shares | Parent Company [Member]                
Stockholders' Equity Attributable to Parent [Abstract]                
Ordinary shares 28     181   173    
Reportable Legal Entities Member | Class B ordinary shares | Parent Company [Member]                
Stockholders' Equity Attributable to Parent [Abstract]                
Ordinary shares $ 5     ¥ 35   ¥ 35