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Provision for Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Foreign-derived intangible income benefit	$ 7	$ 22	$ 39	$ 170	$ 98

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- Definition

Income tax reconciliation foreign derived intangible income benefit.

+ References

No definition available.

+ Details

Name:	cix_IncomeTaxReconciliationForeignDerivedIntangibleIncomeBenefit
Namespace Prefix:	cix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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