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Other Non-Current Assets (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Other Assets Noncurrent [Abstract]      
Rental deposits ¥ 8,330 $ 1,197 ¥ 8,355
Non-current portion of prepayments to suppliers and other business related expenses 8,698 1,249 9,099
Long-term receivable from an unrelated party     6,000
Others 2,831 407  
Total ¥ 19,859 $ 2,853 ¥ 23,454
Long term receivable unrelated party (in year) 2 years    
The interest rate of Loan granted to the unrelated party (in percent) 10.00%