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Co-Development Agreement with Canon US Life Sciences (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Feb. 03, 2015
item
Co-Development Agreement with Canon US Life Sciences    
Revenues $ 188,000us-gaap_SalesRevenueNet  
Co Development Partnership Agreement | Canon U.S. Life Sciences Inc Member    
Co-Development Agreement with Canon US Life Sciences    
Upfront payment received   2,000,000ttoo_CollaborativeArrangementUpfrontPaymentReceived
/ us-gaap_CounterpartyNameAxis
= ttoo_CanonU.s.LifeSciencesIncMember
/ us-gaap_TypeOfArrangementAxis
= ttoo_CoDevelopmentPartnershipAgreementMember
Additional consideration receivable upon achievement of certain development and regulatory milestones   6,500,000ttoo_CollaborativeArrangementAdditionalConsiderationReceivableUponAchievementOfCertainDevelopmentAndRegulatoryMilestones
/ us-gaap_CounterpartyNameAxis
= ttoo_CanonU.s.LifeSciencesIncMember
/ us-gaap_TypeOfArrangementAxis
= ttoo_CoDevelopmentPartnershipAgreementMember
Additional consideration receivable upon achievement of specified technical requirement   1,500,000ttoo_CollaborativeArrangementAdditionalConsiderationReceivableUponAchievementOfSpecifiedTechnicalRequirement
/ us-gaap_CounterpartyNameAxis
= ttoo_CanonU.s.LifeSciencesIncMember
/ us-gaap_TypeOfArrangementAxis
= ttoo_CoDevelopmentPartnershipAgreementMember
Aggregate consideration receivable   8,500,000ttoo_CollaborativeArrangementAggregateConsideration
/ us-gaap_CounterpartyNameAxis
= ttoo_CanonU.s.LifeSciencesIncMember
/ us-gaap_TypeOfArrangementAxis
= ttoo_CoDevelopmentPartnershipAgreementMember
Number of units   1ttoo_CollaborativeArrangementNumberOfUnits
/ us-gaap_CounterpartyNameAxis
= ttoo_CanonU.s.LifeSciencesIncMember
/ us-gaap_TypeOfArrangementAxis
= ttoo_CoDevelopmentPartnershipAgreementMember
Revenues   $ 53,000us-gaap_SalesRevenueNet
/ us-gaap_CounterpartyNameAxis
= ttoo_CanonU.s.LifeSciencesIncMember
/ us-gaap_TypeOfArrangementAxis
= ttoo_CoDevelopmentPartnershipAgreementMember