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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents maturity description	90
Additional amounts to be paid in cash or common stock based on achievement of performance measures within period, maximum years	5 years
Unnamed Corporate Joint Venture One [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity method ownership percentage in joint venture	37.50%
Unnamed Corporate Joint Venture Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity method ownership percentage in joint venture			51.00%
Government Contracts Concentration Risk [Member] | Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of net accounts receivable	22.00%	21.00%
Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	30 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Short-Term investments maturity period, in years	1 year
Intangible assets finite lives	20 years
Maximum [Member] | Medical Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	7 years
Maximum [Member] | Computer Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	7 years
Maximum [Member] | Software and Software Development Costs [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	7 years
Maximum [Member] | Furniture [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	7 years
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets finite lives	1 year
Minimum [Member] | Medical Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	3 years
Minimum [Member] | Computer Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	3 years
Minimum [Member] | Software and Software Development Costs [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	3 years
Minimum [Member] | Furniture [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives, years	3 years

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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