Revenue - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Disaggregation Of Revenue [Line Items]
Revenues	$ 45,557	$ 24,552
Revenue recognized	700
Deferred revenue	3,532	$ 1,283
Deferred Revenue
Disaggregation Of Revenue [Line Items]
Advance deposits	3,500		$ 1,300
COVID-19 Test Revenue
Disaggregation Of Revenue [Line Items]
Revenues	28,300
Lung Diagnostic Revenue
Disaggregation Of Revenue [Line Items]
Revenues	$ 12,600