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Commitments and Contingencies (Commercial Development Agreement) - Additional Information (Detail) (Master Collaboration Agreement [Member], Qiagen [Member], Subsequent Event [Member], USD $)
In Thousands, unless otherwise specified
 1 Months Ended
Mar. 31, 2015
Master Collaboration Agreement [Member] | Qiagen [Member] | Subsequent Event [Member]
  
Other Commitments [Line Items]  
Contingent Milestone Payment $ 1,000tkai_ContingentMilestonePayments
/ us-gaap_CounterpartyNameAxis
= tkai_QiagenMember
/ us-gaap_OtherCommitmentsAxis
= tkai_MasterCollaborationAgreementMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Agreement termination period by the company 180 days
Agreement termination period by both parties 60 days