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Commitment and Contingencies - Additional Information (Details) ¥ in Thousands	Dec. 31, 2019 CNY (¥)
Long-term Investments
Commitments And Contingencies Disclosure [Line Items]
Investment commitment amount	¥ 34,837

X

- Definition

Commitments and contingencies disclosure.

+ References

No definition available.

+ Details

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Namespace Prefix:	stg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_InvestmentTypeAxis=stg_LongTermInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: