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Significant Accounting Policies (Details) ¥ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended | 14 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 CNY (¥) ¥ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Feb. 28, 2021 CNY (¥) | Feb. 28, 2021 USD ($) | Mar. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Nov. 30, 2020 CNY (¥) | Apr. 30, 2019
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Working capital deficit | ¥ 371,553 |  |  |  |  |  |  |  |  |
Accumulated deficit | (2,240,205) |  | ¥ (1,750,475) |  |  |  |  | $ (343,326) |  |
Loss from operations | (494,700) |  | (705,700) | ¥ (456,900) |  |  |  |  |  |
Cash flows from operating activities | (17,337) |  | (223,357) | 52,071 |  |  |  |  |  |
Line of credit | 90,000 |  |  |  |  |  |  |  |  |
Impairment loss on right of use assets | 4,667 |  | 21,103 | 94,311 |  |  |  |  |  |
Impairment loss on property plant equipment | 3,460 |  | 9,479 | 16,892 |  |  |  |  |  |
Impairment loss property held for sale | ¥ 36,505 | $ 5,595 | 52,030 | 111,203 |  |  |  |  |  |
Buying rate per share (in Yuan Renminbi per share) | ¥ / shares | ¥ 6,525 |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 100.00%
Other income | ¥ 13,931 |  | 16,782 | 31,783 |  |  |  |  |  |
Uncertain income tax percentage | 50.00% | 50.00% |  |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 123,385 |  | 171,915 |  |  |  |  |  |  |
Short term borrowings | ¥ 1,000 |  | 28,788 |  |  |  |  |  |  |
Concentration risk, description | There are two customers individually represent greater than 10% of total net revenue for the year ended December 31, 2019, while there is no customer individually represent greater than 10% of total net revenue for the year ended December 31, 2020. There is one customer individually represent greater than 10% of total accounts receivable as of December 31, 2019, while there are three customers individually represent greater than 10% of total accounts receivable as of December 31, 2020.There are no suppliers that individually represent greater than 10% of the total cost of revenue (excluding impairment loss) for the years ended December 31, 2019 and 2020. | There are two customers individually represent greater than 10% of total net revenue for the year ended December 31, 2019, while there is no customer individually represent greater than 10% of total net revenue for the year ended December 31, 2020. There is one customer individually represent greater than 10% of total accounts receivable as of December 31, 2019, while there are three customers individually represent greater than 10% of total accounts receivable as of December 31, 2020.There are no suppliers that individually represent greater than 10% of the total cost of revenue (excluding impairment loss) for the years ended December 31, 2019 and 2020. |  |  |  |  |  |  |  |
PRC Commercial Bank [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  | ¥ 90,000 |
Term deposit to the commercial bank | ¥ 4,760 |  |  |  |  |  |  |  |  |
PRC Commercial Bank One [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Term deposit to the commercial bank | ¥ 6,750 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Financing proceeds through ipo |  |  |  |  | ¥ 120,791 | $ 18,512 |  |  |  |
Subsequent Event [Member] | Unused lines of Credit [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  | ¥ 20,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Voting percentage | 20.00% |  |  |  |  |  |  | 20.00% |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Voting percentage | 50.00% |  |  |  |  |  |  | 50.00% |  |
Notes Payable [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable | ¥ 29,159 |  |  |  |  |  |  |  |  |
Right of Use Assets [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment loss property held for sale | ¥ 28,378 |  | ¥ 21,448 |  |  |  |  |  |  |

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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: 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 3: 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 + Details
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