Summary of Significant Accounting Policies - Disaggregation of Revenue by Major Resource (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 5,911	$ 6,694	$ 13,145	$ 13,650
Product Instruments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	838	480	1,714	905
Product Consumables [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,670	3,179	4,620	7,385
Instrument Rentals [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	51	19	69	38
Total Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,559	3,678	6,403	8,328
Contribution Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 3,352	$ 3,016	$ 6,742	$ 5,322