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Commitments and Contingencies (Details) - 10Q (Operating lease entered into August 2010, USD $)
0 Months Ended
Mar. 31, 2015
Office and laboratory space | Forecast
 
Operating Leased Assets [Line Items]  
Term of lease 2 years
Office Space
 
Operating Leased Assets [Line Items]  
Annual rent owed in 2017 300,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_LeaseArrangementTypeAxis
= ttoo_OperatingLeasesEnteredIntoAugust2010Member
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeBuildingMember