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Revenue Recognition (Changes in Contract Balances) (Details) - Contract liability, current - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognized that was included in the opening contract liability balance	$ (33,315)	$ (39,481)
Cash received or amounts billed in advance and not recognized as revenue	$ 37,116	$ 39,200

X

- Definition

Contract with Customer, Liability, Increase from Cash Receipts Or Amounts Billed In Advance

+ References

No definition available.

+ Details

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

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionMultipleDeliverableArrangementsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=scor_ContractwithCustomerLiabilityCurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: