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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 |  |  |  |
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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 |  |  |  |  |  |  |  |

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- Definition Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
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