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DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Organization) (Details) - CNY (¥) ¥ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Variable Interest Entity [Line Items] |  |  |  |  |
Cash |  | ¥ 810,672 | ¥ 513,938 | ¥ 261,035 | ¥ 159,368
Total current assets |  | 1,450,858 | 1,326,918 |  |
Property and equipment, net |  | 437,337 | 127,864 |  |
Long term investments |  | 41,760 | 24,000 |  |
Other non-current assets |  | 91,849 | 53,111 |  |
Total assets |  | 2,085,012 | 1,653,891 |  |
Income taxes payable |  | 91,240 | 56,293 |  |
Accrued expenses and other current liabilities |  | 117,867 | 79,835 |  |
Amounts due to related parties including amounts due to WOFE for accrued service fees |  | 79 | 879 |  |
Total current liabilities |  | 479,749 | 305,944 |  |
Other non-current liabilities |  | 7,043 | 9,333 |  |
Total liabilities |  | 486,792 | 315,277 |  |
Net revenues |  | 1,579,604 | 1,178,008 | 836,941 |
Net loss |  | 241,854 | 178,760 | 151,850 |
Net cash used in operating activities |  | 524,030 | 347,698 | 175,343 |
Net cash provided by (used in) investing activities |  | (156,449) | (72,309) | (734,539) |
Net cash provided by financing activities |  | (78,044) | (26,899) | 655,026 |
Investment amount in PRC companies, which are engaged in provision of educational products and services |  | ¥ 35,000 |  |  |
Equity Method Investments, Percentage of Equity Acquired through Options |  | 100.00% |  |  |
Proceeds from Collection of Loans Receivable |  | ¥ 3,096 | 1,608 | 2,468 |
Beijing Tarena Jinqiao Technology Co. Ltd. [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Proceeds from Contributed Capital |  | ¥ 3,000 |  |  |
Shanghai Tarena Software Technology Co., Ltd. [Member] | Subsequent Event [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Proceeds from Collection of Loans Receivable | ¥ 1,000 |  |  |  |
Mr. Han [Member] | Tarena Entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 58.80% |  |  |
Mr. Li [Member] | Tarena Entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 12.20% |  |  |
Loan Agreements [Member] | Equity Holders [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | ¥ 6,000 |  |  |
Debt Instrument, Initial Expiration Year |  | 2026 |  |  |
Beijing Tarena [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity Method Investment Summarized Financial Information, Equity |  |  | 2,000 |  |
Shanghai Tarena [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity Method Investment Summarized Financial Information, Equity |  |  | 1,000 |  |
Tarena Entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Cash |  | ¥ 630 | 1,043 |  |
Amounts due from related parties |  | 21,650 | 25,109 |  |
Total current assets |  | 22,280 | 26,152 |  |
Property and equipment, net |  | 3 | 18 |  |
Long term investments |  | 35,000 | 18,000 |  |
Other non-current assets |  | 716 | 266 |  |
Total assets |  | 57,999 | 44,436 |  |
Income taxes payable |  | 3,729 | 3,737 |  |
Accrued expenses and other current liabilities |  | 176 | 892 |  |
Amounts due to related parties including amounts due to WOFE for accrued service fees |  | 46,486 | 39,307 |  |
Total current liabilities |  | 50,391 | 43,936 |  |
Other non-current liabilities |  | 267 | 267 |  |
Total liabilities |  | 50,658 | 44,203 |  |
Net revenues |  |  | 177 | 2,902 |
Net loss |  | (892) | (2,415) | (14,542) |
Net cash used in operating activities |  | (2,166) | (2,201) | (4,252) |
Net cash provided by (used in) investing activities |  | (11,886) | (18,000) | 478 |
Net cash provided by financing activities |  | ¥ 13,639 | ¥ 19,755 | ¥ 4,124 |

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