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Bonds Payable (Details)
$ in Thousands, ¥ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 23, 2021
shares
Jan. 04, 2021
USD ($)
Feb. 02, 2019
CNY (¥)
Feb. 01, 2019
USD ($)
Feb. 01, 2019
CNY (¥)
Jan. 14, 2019
USD ($)
Jan. 14, 2019
CNY (¥)
Jan. 09, 2019
USD ($)
Jan. 09, 2019
CNY (¥)
Nov. 02, 2018
USD ($)
Nov. 02, 2018
CNY (¥)
Jan. 31, 2021
USD ($)
Sep. 28, 2020
CNY (¥)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
CNY (¥)
Jan. 31, 2019
USD ($)
Jan. 31, 2019
CNY (¥)
Jan. 28, 2019
USD ($)
Jan. 28, 2019
CNY (¥)
Dec. 29, 2018
USD ($)
Dec. 29, 2018
CNY (¥)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Sep. 30, 2021
CNY (¥)
Feb. 28, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Nov. 02, 2018
CNY (¥)
Bonds Payable (Details) [Line Items]                                                                    
Bond loan     ¥ 200.0 $ 29,259 ¥ 200.0     $ 14,629 ¥ 100.0                     $ 87,776 ¥ 600.0   $ 43,888 ¥ 300.0         $ 73,147 ¥ 500.0        
Converted from the existing non interest bearing loan                                       $ 29,259 ¥ 200.0                          
Equity holding pledged percentage                                       12.39% 12.39%                          
Previous converted bond loan                                       $ 29,259 ¥ 200.0                          
Estimated enterprise value of the contract                                                     $ 950,000              
Unsubscribed bond loans (in Yuan Renminbi) | ¥                         ¥ 100.0                                          
Previously subscribed bond loans (in Yuan Renminbi) | ¥                 ¥ 400.0                                                  
Aggregate amount of bond loan                   $ 73,147 ¥ 500.0                                              
Cash proceeds received by MPS                   24,869                                               ¥ 170.0
Subscription quota amount           $ 4,388 ¥ 30.0                                                      
Subscription amount                           $ 658 ¥ 4.5 $ 3,730 ¥ 25.5 $ 658 ¥ 4.5               $ 29,915   $ 29,915 ¥ 204.5        
Key contribution conditions, description                                                     Upon issuance of the convertible bond to these third-party investors, the Company signed a contribution and issuance agreement with the existing preferred shareholders on November 2, 2018, in which all preferred shareholders of the Company agreed that when contribution conditions are met, the existing shareholders will exchange their respective Series A1, Series B1 and Series EEL Preferred for Series C1 Preferred shares (“Series C1 Preferred”) for Series A1 shareholders, Series C2 Preferred shares (“Series C2 Preferred”) for Series B1 shareholders and Series D1 Preferred shares(“Series D1 Preferred”) for EEL, respectively, with rights and obligations amended. The key contribution conditions is that the third party convertible bond holders shall have paid MPS an aggregate amount of $29,259 (RMB200 million). As cash contribution of $29,259 was received by MPS on January 30, 2019, the Series C1, C2 and D1 Preferred were issued on the same day. Upon issuance of the convertible bond to these third-party investors, the Company signed a contribution and issuance agreement with the existing preferred shareholders on November 2, 2018, in which all preferred shareholders of the Company agreed that when contribution conditions are met, the existing shareholders will exchange their respective Series A1, Series B1 and Series EEL Preferred for Series C1 Preferred shares (“Series C1 Preferred”) for Series A1 shareholders, Series C2 Preferred shares (“Series C2 Preferred”) for Series B1 shareholders and Series D1 Preferred shares(“Series D1 Preferred”) for EEL, respectively, with rights and obligations amended. The key contribution conditions is that the third party convertible bond holders shall have paid MPS an aggregate amount of $29,259 (RMB200 million). As cash contribution of $29,259 was received by MPS on January 30, 2019, the Series C1, C2 and D1 Preferred were issued on the same day.            
Bond loan                                                     $ 950,000              
Subscribed by bond holders                                                     $ 29,915 ¥ 204.5            
Convertible promissory notes converted common stock shares (in Shares) | shares 6,719,845                                                                  
Purchase agreement to issue convertible promissory note amount   $ 57,500                                                                
Interest rate                                                 6.00%                  
Changes in fair value                                                 $ 9,861                  
Huzhou Saiyuan [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Convertible bond, description                                       MPS signed an agreement with Huzhou Saiyuan, an entity established by the local government, to issue convertible bonds to Huzhou Saiyuan for a total consideration of $87,776 (RMB600 million), of which $29,259 (RMB200 million) was converted from the existing non-interest-bearing loan with Huzhou Saiyuan as of December 31, 2018. The Company pledged its 12.39% equity holding over MPS to Huzhou Saiyuan to facilitate the issuance of convertible bonds. Besides the previous converted bond $29,259 (RMB200 million), Huzhou Saiyuan further subscribed $14,629 (RMB100 million) on January 9, 2019 and $29,259 (RMB200 million) on February 1, 2019, respectively. As of December 31, 2019, the outstanding balance of the convertible bonds to Huzhou Saiyuan was $73,147 (RMB500 million), of which $43,888 (RMB300 million) will be due within 1 year. MPS signed an agreement with Huzhou Saiyuan, an entity established by the local government, to issue convertible bonds to Huzhou Saiyuan for a total consideration of $87,776 (RMB600 million), of which $29,259 (RMB200 million) was converted from the existing non-interest-bearing loan with Huzhou Saiyuan as of December 31, 2018. The Company pledged its 12.39% equity holding over MPS to Huzhou Saiyuan to facilitate the issuance of convertible bonds. Besides the previous converted bond $29,259 (RMB200 million), Huzhou Saiyuan further subscribed $14,629 (RMB100 million) on January 9, 2019 and $29,259 (RMB200 million) on February 1, 2019, respectively. As of December 31, 2019, the outstanding balance of the convertible bonds to Huzhou Saiyuan was $73,147 (RMB500 million), of which $43,888 (RMB300 million) will be due within 1 year.                          
Subscribed bonds, description                                                     If the subscribed bonds are not repaid by the maturity date, Huzhou Saiyuan has the right to dispose the equity interests pledged by the Company in proportion to the amount of matured bonds, or convert the bond to the equity interests of MPS within 60 days after the maturity date. If Huzhou Saiyuan decides to convert the bonds to equity interests of MPS, the equity interests pledged should be released and the convertible bonds should be converted to the equity interest of MPS based on the entity value of MPS at $950,000. If the subscribed bonds are not repaid by the maturity date, Huzhou Saiyuan has the right to dispose the equity interests pledged by the Company in proportion to the amount of matured bonds, or convert the bond to the equity interests of MPS within 60 days after the maturity date. If Huzhou Saiyuan decides to convert the bonds to equity interests of MPS, the equity interests pledged should be released and the convertible bonds should be converted to the equity interest of MPS based on the entity value of MPS at $950,000.            
Outstanding balance                                                   $ 73,147 $ 73,147       ¥ 500.0   ¥ 500.0  
Bond loan                                                   $ 950,000                
Third Party Investors [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Aggregate amount of bond loan                   $ 58,516 ¥ 400.0                                              
First Tranche [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Convertible promissory notes issued amount                       $ 25,000                                            
Second Tranche [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Convertible promissory notes issued amount                                                               $ 32,500    
Minimum [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Discounted rate                       80.00%                                            
Maximum [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Discounted rate                       90.00%                                            
Convertible Notes [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Convertible promissory notes converted common stock shares (in Shares) | shares 6,736,106                                                                  
Changes in fair value                                           $ 3,018                        
Extended Maturity [Member]                                                                    
Bonds Payable (Details) [Line Items]                                                                    
Extended maturity date                                                   1 year