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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT ¥ in Thousands, $ in Thousands		CNY (¥)	USD ($)	Class A Ordinary Shares CNY (¥) shares	Class B Ordinary Shares shares	Class C Ordinary Shares CNY (¥) shares	Ordinary Shares CNY (¥) shares	Additional Paid-in Capital CNY (¥)	Additional Paid-in Capital USD ($)	Treasury Stock shares	Accumulated Other Comprehensive (Loss)/Income CNY (¥)	Accumulated Other Comprehensive (Loss)/Income USD ($)	Accumulated Deficit CNY (¥)	Accumulated Deficit USD ($)	Total Sunlands Technology Group Shareholders' Deficit CNY (¥)	Total Sunlands Technology Group Shareholders' Deficit USD ($)	Noncontrolling Interest CNY (¥)	Noncontrolling Interest USD ($)
Balances at Dec. 31, 2016		¥ (888,955)					¥ 1	¥ 30,911					¥ (919,867)		¥ (888,955)
Balances (in shares) at Dec. 31, 2016 | shares							3,818,618
Net loss for the year		(918,714)											(918,578)		(918,578)		¥ (136)
Capital contribution from a noncontrolling shareholder		200															200
Repurchase of equity from shareholders	[1]	(71,303)						(30,000)					(41,303)		(71,303)
Cash dividend to a Series A convertible redeemable preferred shareholder		(43,000)											(43,000)		(43,000)
Shares issuance in relation to share-based compensation, shares | shares							510,382
Share-based compensation		288,763						288,763							288,763
Foreign currency translation adjustments		(8,759)									¥ (8,759)				(8,759)
Balances at Dec. 31, 2017		(1,641,768)					¥ 1	289,674			(8,759)		(1,922,748)		(1,641,832)		64
Balances (in shares) at Dec. 31, 2017 | shares							4,329,000
Net loss for the year		(926,950)											(927,022)		(927,022)		72
Issuance of ordinary shares, net of issuance cost of 80,128		1,109,517						1,109,517							1,109,517
Issuance of ordinary shares, net of issuance cost, shares | shares				659,131
Conversion of convertible redeemable preferred shares upon initial public offering (Note 13)		1,024,709		¥ 1		¥ 1	¥ (1)	1,024,708							1,024,709
Conversion of convertible redeemable preferred shares upon initial public offering (Note 13), shares | shares				1,159,252	826,389	4,265,286	(4,329,000)
Share repurchase		(34,828)						(34,828)							(34,828)
Share repurchase, shares | shares				(45,082)						45,082
Share-based compensation		2,751						2,751							2,751
Foreign currency translation adjustments		127,586									127,586				127,586
Balances at Dec. 31, 2018		(338,983)		¥ 1		¥ 1		2,391,822			118,827		(2,849,770)		(339,119)		136
Balances (in shares) at Dec. 31, 2018 | shares				1,773,301	826,389	4,265,286				45,082
Net loss for the year		(395,165)	$ (56,763)										(394,817)		(394,817)		(348)
Conversion Class C Ordinary shares to Class A Ordinary shares (Note 13), shares | shares				6,600		(6,600)
Share repurchase		(30,793)						(30,793)							(30,793)
Share repurchase, shares | shares				(51,895)						51,895
Share-based compensation		2,970						2,970							2,970
Foreign currency translation adjustments		23,608	3,391								23,608				23,608
Balances at Dec. 31, 2019		¥ (738,363)	$ (106,059)	¥ 1		¥ 1		¥ 2,363,999	$ 339,567		¥ 142,435	$ 20,460	¥ (3,244,587)	$ (466,056)	¥ (738,151)	$ (106,029)	¥ (212)	$ (30)
Balances (in shares) at Dec. 31, 2019 | shares				1,728,006	826,389	4,258,686				96,977
[1] In July 2017, Beijing Shangde Online Education Technology Co., Ltd. (“Beijing Sunlands”) repurchased equity interests held by certain shareholders at a total cash consideration of RMB71,303. Such equity interests of Beijing Sunlands were originally acquired at a cost of RMB30,000.

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-Topic 210
-SubTopic 10
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-Paragraph 1
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- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

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-Name Accounting Standards Codification
-Topic 810
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-Paragraph 16
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