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Nature of Business (Details) (USD $)
0 Months Ended
Aug. 12, 2014
Mar. 31, 2015
Dec. 31, 2014
Jul. 11, 2014
Accumulated deficit   $ (114,213,000)us-gaap_RetainedEarningsAccumulatedDeficit $ (103,595,000)us-gaap_RetainedEarningsAccumulatedDeficit  
Note Agreement 1        
Maximum borrowings available       30,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ttoo_LoanAndSecurityAgreementMember
IPO        
Period over which cash resources will be sufficient to allow Company to fund current operating plan 12 months      
IPO | Note Agreement 1        
Maximum borrowings available       $ 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ttoo_LoanAndSecurityAgreementMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember