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Convertible Bond (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2019
CNY (¥)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 31, 2019
USD ($)
Debt Disclosure [Abstract]          
Convertible bond ¥ 71,477       $ 10,000
Ordinary shares to the Holder for securing the bond (in Shares) | shares 697,977        
Bond convertible principal amounts   $ 5,000 $ 4,000 $ 1,000  
Conversion price determined based on the pre-money valuation   $ 800,000 $ 1,360,000 $ 2,500,000  
Bond bears annual interest rate 8.00%