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Stockholders’ Equity (SBC) (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jan. 31, 2015
Stock-based compensation        
Stock-based compensation expense $ 1,620,831us-gaap_AllocatedShareBasedCompensationExpense $ 813,678us-gaap_AllocatedShareBasedCompensationExpense    
Research and development        
Stock-based compensation        
Stock-based compensation expense 469,678us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
238,471us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
   
General and administrative        
Stock-based compensation        
Stock-based compensation expense 1,151,153us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
575,207us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
   
Options awards        
Stock-based compensation        
Stock-based compensation expense 1,327,207us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
784,811us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Additional disclosures        
Contractual life 8 years      
Shares        
Outstanding at the beginning of the period (in shares) 3,277,308us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
    3,277,308us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Granted (in shares) 775,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Exercised (in shares) (22,020)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Forfeited (in shares) (7,286)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Outstanding at the end of the period (in shares) 4,023,902us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  3,277,308us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Vested and expected to vest (in shares) 3,968,251us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Exercisable (in shares) 1,885,991us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Weighted-Average Exercise Price Per Share        
Outstanding at beginning of the period (in dollars per share) $ 5.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
    $ 5.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Granted (in dollars per share) $ 5.18us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Exercised (in dollars per share) $ 1.29us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Forfeited (in dollars per share) $ 5.24us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Outstanding at the end of the period (in dollars per share) $ 5.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  $ 5.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Vested and expected to vest at the end of the period (in dollars per share) $ 5.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Exercisable at the end of the period (in dollars per share) $ 5.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Weighted-Average Contractual Life (In Years)        
Outstanding at the end of the period 8 years 7 months 6 days   8 years 6 months  
Vested and expected to vest at the end of the period 8 years 7 months 6 days      
Exercisable at the end of the period 8 years      
Fair Value of Options Granted        
Granted 3,066,622tlog_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantedInPeriodFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Aggregate Intrinsic Value        
Outstanding at the end of the period     13,575,815us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Options awards | Executive Officers        
Additional disclosures        
Vesting (as a percent)       2.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tlog_ExecutiveOfficersMember
Minimum closing price (in dollars per share)       $ 20.00tlog_ShareBasedCompensationArrangementByShareBasedPaymentAwardClosingPriceMinimumForCertainVestingRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tlog_ExecutiveOfficersMember
Consecutive trading days       5 days
Vesting period       1 year 10 months 17 days
Shares        
Granted (in shares)       600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tlog_ExecutiveOfficersMember
Restricted stock awards        
Stock-based compensation        
Stock-based compensation expense $ 293,624us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 28,867us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Restricted stock awards | Executive Officers        
Additional disclosures        
Minimum closing price (in dollars per share)       $ 20.00tlog_ShareBasedCompensationArrangementByShareBasedPaymentAwardClosingPriceMinimumForCertainVestingRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tlog_ExecutiveOfficersMember
Consecutive trading days       5 days
Vesting period       3 years