Fixed Assets - Major Classes of Fixed Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 59,826	$ 51,119
Less: Accumulated depreciation	(12,839)	(10,920)
Fixed assets, net	46,987	40,199
Computer Hardware
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 3,948	3,699
Useful life in years	3 years
Building
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 6,731	6,731
Useful life in years	39 years
Computer Software
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 594	541
Computer Software | Minimum
Property Plant And Equipment [Line Items]
Useful life in years	3 years
Computer Software | Maximum
Property Plant And Equipment [Line Items]
Useful life in years	5 years
Aircraft
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 6,503	6,503
Useful life in years	7 years
Medical Lab Equipment
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 26,568	20,849
Useful life in years	5 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 903	454
Furniture and Fixtures | Minimum
Property Plant And Equipment [Line Items]
Useful life in years	2 years
Furniture and Fixtures | Maximum
Property Plant And Equipment [Line Items]
Useful life in years	5 years
Building Improvements
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 707	707
Building Improvements | Minimum
Property Plant And Equipment [Line Items]
Useful life in years	6 months
Building Improvements | Maximum
Property Plant And Equipment [Line Items]
Useful life in years	5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 1,618	1,580
Useful life in years	Shorter of lease term or estimated useful life
Assets Not Yet Placed in Service
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 3,592	2,055
Land Improvements
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 403	403
Land Improvements | Minimum
Property Plant And Equipment [Line Items]
Useful life in years	5 years
Land Improvements | Maximum
Property Plant And Equipment [Line Items]
Useful life in years	15 years
Automobile
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 715	53
Automobile | Minimum
Property Plant And Equipment [Line Items]
Useful life in years	2 years
Automobile | Maximum
Property Plant And Equipment [Line Items]
Useful life in years	5 years
General Equipment
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 44	44
General Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful life in years	3 years
General Equipment | Maximum
Property Plant And Equipment [Line Items]
Useful life in years	5 years
Land
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 7,500	$ 7,500