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Summary of Principal Accounting Policies - Allowance for Doubtful Accounts (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Allowance for doubtful accounts |  |  |  |
Balance at beginning of the year | ¥ 0 |  | ¥ 0 |
Provisions | 130,723 | $ 18,777 | (688) | ¥ 2,093
Balance at end of the year | 0 |  | ¥ 0 | ¥ 0
Amount Due From Related Party |  |  |  |
Allowance for doubtful accounts |  |  |  |
Provisions | 14,602 |  |  |
Write off | (14,602) |  |  |
Accounts Receivable |  |  |  |
Allowance for doubtful accounts |  |  |  |
Provisions | 11,858 |  |  |
Write off | (11,858) |  |  |
Loan Receivables From Factoring Business |  |  |  |
Allowance for doubtful accounts |  |  |  |
Provisions | 82,000 |  |  |
Write off | (82,000) |  |  |
Other Receivables |  |  |  |
Allowance for doubtful accounts |  |  |  |
Provisions | 16,912 |  |  |
Write off | ¥ (16,912) |  |  |

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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