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Organization and Principal Activities - Assets and Liabilities of VIEs and its Subsidiaries and Group's taken as Whole (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Variable Interest Entity [Line Items]        
Cash and cash equivalents ¥ 586,955 $ 92,106 ¥ 504,108 ¥ 972,438
Short-term investments 828,867 130,067 696,051  
Accounts receivable from third parties 302,336 47,443 427,352  
Accounts receivable from a related party 320,939 50,362 609,094  
Inventories 576,351 90,442 439,375  
Total assets 3,276,714 514,188 3,179,519  
Accounts and notes payable current 1,069,108 167,766 1,001,371  
Total liabilities 1,625,787 $ 255,121 1,649,200  
VIEs        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 353,554   338,748  
Short-term investments 820,344   579,457  
Accounts receivable from third parties 204,769   412,118  
Accounts receivable from a related party 320,939   609,094  
Inventories 362,385   392,574  
Amount due from Group companies 232,203   106,956  
Other assets 383,569   395,941  
Total assets 2,677,763   2,834,888  
Accounts and notes payable current 545,966   860,454  
Accrued expenses and other liabilities 292,388   302,256  
Amount due to Group companies 824,304   480,058  
Other liabilities 122,508   293,413  
Total liabilities ¥ 1,785,166   ¥ 1,936,181