NET INCOME LOSS PER SHARE - Computation of Basic and Diluted Net Income Loss Per Share (Details) ¥ / shares in Units, ¥ in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022 USD ($) shares	Jun. 30, 2022 CNY (¥) shares	Jun. 30, 2021 CNY (¥) shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2022 CNY (¥) ¥ / shares shares	Jun. 30, 2021 CNY (¥) ¥ / shares shares
Numerator:
Numerator for basic and diluted net (loss) income per share	$ (10,667)	¥ (71,448)	¥ 22,440	$ (13,291)	¥ (89,018)	¥ 8,111
Denominator:
Denominator for basic net (loss) income per share weighted average ordinary shares outstanding (in shares)	46,825,968	46,825,968	46,648,495	46,756,368	46,756,368	46,642,280
Denominator for diluted net (loss) income per share weighted average ordinary shares outstanding (in shares)	46,825,968	46,825,968	46,648,495	46,756,368	46,756,368	46,642,280
Basic net (loss) income per share \| ¥ / shares					¥ (1.90)	¥ 0.17
Diluted net (loss) income per share \| ¥ / shares					¥ (1.87)	¥ 0.17
Anti-dilutive shares that were excluded from the calculation of diluted net income (loss) per share				20,833	20,833

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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