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Supplemental Balance Sheet Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,927us-gaap_PropertyPlantAndEquipmentGross $ 6,102us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (3,595)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (3,342)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 5,332us-gaap_PropertyPlantAndEquipmentNet 2,760us-gaap_PropertyPlantAndEquipmentNet
Accrued expenses    
Accrued payroll and compensation 1,457us-gaap_EmployeeRelatedLiabilitiesCurrent 1,846us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued professional services 428us-gaap_AccruedProfessionalFeesCurrent 374us-gaap_AccruedProfessionalFeesCurrent
Accrued research and development expenses 635ttoo_AccruedResearchAndDevelopmentExpensesCurrent 733ttoo_AccruedResearchAndDevelopmentExpensesCurrent
Other accrued expenses 906us-gaap_OtherAccruedLiabilitiesCurrent 709us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses 3,426us-gaap_AccruedLiabilitiesCurrent 3,662us-gaap_AccruedLiabilitiesCurrent
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 384us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
383us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 505us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
480us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Laboratory equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,380us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
3,312us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Furniture    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 187us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
187us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Manufacturing tooling and molds    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 26us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
26us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 833us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
764us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,428us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
387us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
T2Dx instruments and components    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,184us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ttoo_T2dxInstrumentsAndComponentsMember
$ 563us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ttoo_T2dxInstrumentsAndComponentsMember