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Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended 9 Months Ended
Jan. 01, 2019
USD ($)
lease_arrangement
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Segment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Product Information [Line Items]            
Number of operating segments | Segment       1    
Total revenue   $ 1,677,000 $ 2,466,000 $ 5,266,000 $ 8,708,000  
Outstanding receivable   1,573,000   1,573,000   $ 1,786,000
Aggregate amount of transaction price allocated to remaining performance obligations for contracts with original duration greater than one year   3,500,000   $ 3,500,000    
Remaining performance obligation, expected timing of satisfaction       The Company expects to recognize revenue on the remaining performance obligations over the next two years.    
Contract assets   0   $ 0   0
Contract liabilities   600,000   600,000   600,000
Revenue recognized relating to contract liabilities   100,000   400,000    
Costs to obtain or fulfill contract capitalized   0   0    
Operating lease liabilities   4,303,000   4,303,000    
Right-of-use assets   3,740,000   3,740,000    
Co Development Partnership Agreement [Member] | CARB-X [Member]            
Product Information [Line Items]            
Total revenue   100,000 400,000 $ 900,000 900,000  
Accounting Standards Update 2016-02 [Member]            
Product Information [Line Items]            
Maximum short-term lease exception period       12 months    
Number of operating lease arrangements | lease_arrangement 8          
Number of finance lease arrangements | lease_arrangement 2          
Operating lease liabilities $ 5,600,000          
Right-of-use assets 4,800,000          
Accrued rent liability $ 800,000          
T2 Dx [Member]            
Product Information [Line Items]            
Maintenance Services period (in years)       1 year    
Additional period for Maintenance Service option (in years)       1 year    
Constrained Revenue [Member]            
Product Information [Line Items]            
Aggregate amount of transaction price allocated to remaining performance obligations for contracts with original duration greater than one year   3,000,000   $ 3,000,000    
Instrument Rentals [Member]            
Product Information [Line Items]            
Total revenue   30,000 106,000 171,000 344,000  
Lease revenue   100,000   $ 200,000    
Maximum [Member]            
Product Information [Line Items]            
Original expected period of contracts for which value of unsatisfied performance obligations not to be disclosed       1 year    
Minimum [Member]            
Product Information [Line Items]            
Aggregate amount of transaction price allocated to remaining performance obligations, original duration       1 year    
Non-US [Member]            
Product Information [Line Items]            
Total revenue   600,000 $ 600,000 $ 1,800,000 $ 1,400,000  
Outstanding receivable   $ 500,000   $ 500,000   $ 900,000
Revenue [Member] | Geographic Concentration Risk [Member] | Non-US [Member]            
Product Information [Line Items]            
Total revenue (as a percent)   36.00% 25.00% 34.00% 16.00%  
Revenue [Member] | Geographic Concentration Risk [Member] | Non-US [Member] | Maximum [Member]            
Product Information [Line Items]            
Total revenue (as a percent)   10.00%   10.00% 10.00%  
Customer One [Member] | Revenue [Member] | Geographic Concentration Risk [Member] | Non-US [Member] | Maximum [Member]            
Product Information [Line Items]            
Total revenue (as a percent)     10.00%