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Summary of Significant Accounting Policies Product Service (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2016
Product information        
Deferred revenue $ 2,127     $ 2,445
Costs of product revenue $ 1,627 $ 1,026    
T2Dx        
Product information        
Maintenance Services period (in years) 1 year      
Additional period for Maintenance Service option (in years) 1 year      
T2Candida        
Product information        
Deferred revenue $ 37   $ 100  
Costs of product revenue     $ 41  
Remaining warranty reserve $ 2