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DEFERRED REVENUE (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended		12 Months Ended
	Jan. 26, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Beginning balance	$ 1,971	$ 2,282	$ 0	$ 1,889
Additions	620		237,568	5,116
Revenue recognized	(309)		(167,404)	(5,034)
Ending balance	$ 2,282	70,164	$ 70,164	$ 1,971
Additional amounts deferred attributable to the acquisitions		$ 61,156

X

- Definition

Contract with Customer, Liability, Additions

+ References

No definition available.

+ Details

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Namespace Prefix:	sst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Revenue Recognized, Increase (Decrease)

+ References

No definition available.

+ Details

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Namespace Prefix:	sst_
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

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Period Type:	instant

X

- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

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X

- References

No definition available.

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