Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)			1 Months Ended	12 Months Ended
	Oct. 01, 2018	Dec. 07, 2017	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Jan. 01, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Expected term				9 months
Cash, Uninsured Amount				$ 118,600,000	$ 135,300,000
Restricted Cash				0	18,000,000
Increase in Restricted Cash					18,000,000
Marketable Securities, Current				1,127,102	1,143,095
Allowance for Doubtful Accounts Receivable, Current				4,300,000	400,000
Goodwill and Intangible Asset Impairment, Total				$ 3,798,866	2,431,791
Equity Method Investment, Significant Influence Description				Significant influence is generally deemed to exist if the Company has an ownership interest in the voting stock of the investee of between 20% and 50%, although other factors, such as representation on the investee’s board of directors, are considered in determining whether the equity method of accounting is appropriate.
Payment Of Revenue	$ 8,300,000		$ 7,300,000
Restricted Cash, Noncurrent				$ 745,470	745,235
All-Inclusive Population-Based Payments to be Received	5,500,000
Deferred Revenue, Current				9,100,000	300,000
Lessee, Operating Lease, Liability, Payments, Due				7,100,000
Billing In Excess Of Costs				34,500,000
Contract with Customer, Liability, Revenue Recognized				200,000
Payment of revenue reduce	$ 5,500,000
Prior Period Reclassification Adjustment				1,300,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents				107,636,973	118,500,095			$ 54,925,712
Net Cash Provided by (Used in) Investing Activities				(25,182,818)	26,716,009
Risk Pool Settlement				$ 5,900,000
Description Of Percentage On Medical Liabilities Program Recorded				as APAACO’s NGACO program was new and sufficient claims history was not available, the medical liabilities for the NGACO program were estimated and recorded at 100​​​​​​​% of the revenue less actual claims processed for or paid to in-network providers.
Restatement Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents					99,700,000		$ 54,900,000
Net Cash Provided by (Used in) Investing Activities					26,700,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect					63,600,000
Previously Reported [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents					118,500,000		$ 44,900,000
Net Cash Provided by (Used in) Investing Activities					8,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect					$ 44,900,000
Warrant Liability [Member]
Summary Of Significant Accounting Policies [Line Items]
Risk free interest rate		1.90%
Share Price		$ 9.99
Percentage For Down round financing		0.00%
Derivative Asset, Noncurrent		$ 5,300,000
Maximum
Summary Of Significant Accounting Policies [Line Items]
Expected term					1 year 9 months
Risk free interest rate				1.86%	1.86%
Expected volatility rate				41.60%	41.60%
Share Price				$ 0.76	$ 0.76
Restricted Cash Interest Rate				0.10%
Maximum | Scenario, Forecast [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset						$ 9,000,000
Maximum | Warrant Liability [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected term				3 years 3 months 22 days
Expected volatility rate		40.26%
Minimum
Summary Of Significant Accounting Policies [Line Items]
Expected term					11 months 5 days
Risk free interest rate				1.64%	1.64%
Expected volatility rate				38.10%	38.10%
Share Price				$ 0.52	$ 0.52
Restricted Cash Interest Rate				0.05%
Minimum | Scenario, Forecast [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset						$ 7,000,000
Minimum | Warrant Liability [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected term				2 years 10 months 6 days
Expected volatility rate		39.24%
Network Medical Management, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Dividends Paid				$ 18,000,000
APCN [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted Cash, Noncurrent				$ 4,200,000