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Share-based payments - Schedule of Unvested Restricted Share Activity (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2017 shares
Cumulative Restricted Stock Units Under Vested Not Delivered [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cumulative restricted stock units under vested not delivered	6,345,921

X

- Definition

Share based compensation arrangement by share based payment award equity instruments other than options vested and unissued in period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cogt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=cogt_CumulativeRestrictedStockUnitsUnderVestedNotDeliveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: