Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Product Information [Line Items]
Number of operating segments | Segment			1
Total revenue	$ 5,911,000	$ 6,694,000	$ 13,145,000	$ 13,650,000
Outstanding receivable	2,721,000		2,721,000		$ 5,134,000
Marketable securities	0		$ 0		9,996,000
Remaining performance obligation, expected timing of satisfaction			The Company expects to recognize 44% of this amount as revenue within one year and the remainder within two years.
Contract assets	0		$ 0		0
Contract liabilities	$ 200,000		200,000		500,000
Revenue recognized relating to contract liabilities			$ 400,000
Accounting Standards Update 2020-06 [Member]
Product Information [Line Items]
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022		Jan. 01, 2022
Change in accounting principle, accounting standards update, immaterial effect	true		true
Accounting Standards Update 2021-04 [Member]
Product Information [Line Items]
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022		Jan. 01, 2022
Change in accounting principle, accounting standards update, immaterial effect	true		true
Accounting Standards Update 2021-10 [Member]
Product Information [Line Items]
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022		Jan. 01, 2022
Change in accounting principle, accounting standards update, immaterial effect	true		true
Prepaid and Other Current Assets [Member]
Product Information [Line Items]
Costs to obtain or fulfill contract capitalized					100,000
T2 Dx [Member]
Product Information [Line Items]
Maintenance Services period (in years)			1 year
Additional period for Maintenance Service option (in years)			1 year
Maximum [Member]
Product Information [Line Items]
Original expected period of contracts for which value of unsatisfied performance obligations not to be disclosed			1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years		2 years
Maximum [Member] | Prepaid and Other Current Assets [Member]
Product Information [Line Items]
Costs to obtain or fulfill contract capitalized	$ 100,000		$ 100,000
Maximum [Member] | Other Non-Current Assets [Member]
Product Information [Line Items]
Costs to obtain or fulfill contract capitalized	100,000		100,000		100,000
Non-US [Member]
Product Information [Line Items]
Total revenue	1,000,000.0	$ 500,000	2,000,000.0	$ 1,000,000.0
Outstanding receivable	$ 800,000		$ 800,000		$ 600,000
Revenue [Member] | Geographic Concentration Risk [Member] | Non-US [Member]
Product Information [Line Items]
Total revenue (as a percent)	17.00%	8.00%	15.00%	7.00%
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%	10.00%