Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 26,319	$ 25,572
Less: accumulated depreciation	(13,357)	(11,902)
Property and equipment, net	12,962	13,670
Medical diagnostic equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	17,330	16,759
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	433	433
Office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	1,573	1,538
Laboratory equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	5,320	5,302
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	580	582
Construction in process
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,083	$ 958