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Commitments and Contingencies - Future Minimum Capital Payments under Certain Data Licensing Agreements (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2018	$ 4,990
2019	5,930
2020	6,250
2021	4,775
2022	1,302
Total	$ 23,247

X

- Definition

Capital commitment under certain data licensing agreements due in the next fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	cogt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Capital commitment under certain data licensing agreements due in five years.

+ References

No definition available.

+ Details

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Namespace Prefix:	cogt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Capital commitment under certain data licensing agreements due in four years.

+ References

No definition available.

+ Details

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Namespace Prefix:	cogt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Capital commitment under certain data licensing agreements due in three years.

+ References

No definition available.

+ Details

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Namespace Prefix:	cogt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Capital commitment under certain data licensing agreements due in two years.

+ References

No definition available.

+ Details

Name:	cogt_CapitalCommitmentUnderCertainDataLicensingAgreementsDueInTwoYears
Namespace Prefix:	cogt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Capital commitment under certain data licensing agreements, net.

+ References

No definition available.

+ Details

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Namespace Prefix:	cogt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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