Summary of Significant Accounting Policies - Disaggregation of Revenue by Major Resource (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 7,234	$ 6,956
Product Instruments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	876	425
Product Consumables [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,950	4,206
Instrument Rentals [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	18	19
Total Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3,844	4,650
Contribution Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 3,390	$ 2,306