The Company, Business Activities and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
The Company Business Activities And Basis Of Presentation [Line Items]
Net revenues	$ 19,945	$ 17,756
Reserves related to aged account receivable		600
Unbilled accounts receivables	2,700	4,300
Commercial Test Revenue [Member]
The Company Business Activities And Basis Of Presentation [Line Items]
Net revenues	19,900	17,700
Commercial Test Revenue [Member] | RT-PCR COVID-19 Testing [Member]
The Company Business Activities And Basis Of Presentation [Line Items]
Net revenues	$ 18,600	$ 16,800
ASC 606 [Member]
The Company Business Activities And Basis Of Presentation [Line Items]
Performance obligation, description of timing	The duration of time between accession receipt and delivery of a valid assay result to the ordering physician or entity is typically less than two weeks, and for our RT-PCR COVID-19 testing, typically 48 hours or less.
Practical expedient, description	The Company does not adjust the transaction price for the effects of a significant financing component, as at contract inception, the Company expects the collection cycle to be one year or less.
ASC 606 [Member] | Maximum [Member] | Sales and Marketing Expenses [Member]
The Company Business Activities And Basis Of Presentation [Line Items]
Amortization period	1 year