Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 72,290	$ 76,157
Accumulated depreciation	(41,944)	(45,739)
Net property and equipment	30,346	30,418
Medical equipment and facilities
Property, Plant and Equipment [Line Items]
Property and equipment, gross	70,718	75,657
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	394	330
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,178	$ 170