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Commitments and Contingencies (Leases) - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Feb. 28, 2015
sqft
Other Commitments [Line Items]      
Rental expense $ 306us-gaap_LeaseAndRentalExpense $ 106us-gaap_LeaseAndRentalExpense  
Sublease [Member]      
Other Commitments [Line Items]      
Area of office space     15,981tkai_AreaOfOfficeSpace
/ us-gaap_LeaseArrangementTypeAxis
= tkai_SubleaseMember
Subleases expiration date Dec. 31, 2016    
Old Lease [Member]      
Other Commitments [Line Items]      
Exit cost 133us-gaap_BusinessExitCosts1
/ us-gaap_LeaseArrangementTypeAxis
= tkai_OldLeaseMember
   
Operating service agreement period 30 days    
Prime Lease [Member]      
Other Commitments [Line Items]      
Future minimum lease payments in 2015 408us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_LeaseArrangementTypeAxis
= tkai_PrimeLeaseMember
   
Future minimum lease payments in 2016 555us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_LeaseArrangementTypeAxis
= tkai_PrimeLeaseMember
   
Future minimum lease payments total $ 963us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_LeaseArrangementTypeAxis
= tkai_PrimeLeaseMember