Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		6 Months Ended
	Jan. 01, 2019 USD ($) lease_arrangement	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Product Information [Line Items]
Number of operating segments | Segment				1
Total revenue		$ 1,804,000	$ 3,931,000	$ 3,589,000	$ 6,242,000
Outstanding receivable		1,179,000		1,179,000		$ 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 2 years.
Contract assets		0		$ 0		0
Contract liabilities		700,000		700,000		600,000
Revenue recognized relating to contract liabilities		100,000		200,000
Costs to obtain or fulfill contract capitalized		0		0
Operating lease liabilities		4,737,000		4,737,000
Right-of-use assets		4,108,000		$ 4,108,000
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		95,000	157,000	$ 141,000	238,000
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	$ 500,000	$ 1,200,000	$ 800,000
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)		31.00%	12.00%	34.00%	13.00%
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]
Product Information [Line Items]
Total revenue (as a percent)				10.00%