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SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2020 CNY (¥) segment	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2020 CNY (¥)
Number of Operating Segments | segment	2	2
Revenues	$ 81,529	¥ 531,980	¥ 583,909	¥ 531,508
Accounts receivable, net	3,214		17,939		¥ 20,972
Unsatisfied performance obligation			165,111	124,250
Deferred revenue	$ 25,088		165,111		163,699
K-12 Schools [Member]
Revenues		291,539	313,747	277,790
Deferred revenue			96,301		126,564
CP&CE Programs
Revenues		¥ 240,441	270,162	¥ 253,718
Deferred revenue			¥ 68,810		¥ 37,135

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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