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Summary of Significant Principal Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Significant Principal Accounting Policies [Abstract] |
Schedule of concentration of customers and suppliers | The following customer accounted for 10% or more of revenue for the years ended December 31, 2015 and 2016:
|  | For Year Ended December 31, |
|  | 2015 |  | 2016 |
|  | RMB |  | RMB |
A |  |  |  | * |  | 351,204 |
The following customer accounted for 10% or more of balances of accounts receivable as of December 31, 2015 and 2016:
|  | As of December 31, |
|  | 2015 |  | 2016 |
|  | RMB |  | RMB |
A |  |  | 77,764 |  |  | 193,775 |
The following suppliers accounted for 10% or more of purchases for the years ended December 31, 2015 and 2016:
|  | For Year Ended December 31, |
|  | 2015 |  | 2016 |
|  | RMB |  | RMB |
B |  |  | 257,069 |  |  | 629,780 |
C |  |  | 317,576 |  |  | 551,459 |
D |  |  | 245,427 |  |  |  | *
* Not more than 10% or more.
Schedule of estimated useful lives and residual rates | The estimated useful lives and residual rates are as follows:
Classification |  | Useful years |  | Residual rate |
Electronic devices |  | 3 years |  |  | 0% - 5 | %
Vehicle |  | 5 years |  |  | 5 | %
Furniture and office equipment |  | 5 years |  |  | 5 | %
Machinery |  | 10 years |  |  | 5 | %
Leasehold improvement |  | Over the shorter of the expected life of leasehold improvements or the lease term |  |  | 0 | %

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6327-108592 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 + Details
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