Summary of Significant Accounting Policies - Disaggregation of Revenue by Major Resource (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 6,956	$ 2,545
Product Instruments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	425	247
Product Consumables [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	4,206	745
Instrument Rentals [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	19	53
Total Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	4,650	1,045
Contribution Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 2,306	$ 1,500