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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash, Uninsured Amount |  | $ 146,300,000 |  | $ 146,300,000 |  |
Restricted Cash |  | 4,218,176 |  | 4,218,176 |  | $ 18,005,661
Increase in Restricted Cash |  |  |  |  |  | 18,000,000
Allowance for Doubtful Accounts Receivable, Current |  | 719,938 |  | $ 719,938 |  | $ 407,953
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. |  |
Payments of Dividends |  |  |  | $ 16,725,799 | $ 9,490,632 |
Impairment of Intangible Assets, Finite-lived |  |  |  | 0 | 0 |
Goodwill and Intangible Asset Impairment |  |  |  | 0 | 0 |
Equity Method Investment, Impairment |  | $ 0 | $ 0 | $ 0 | $ 0 |
Variable Interest Entity Percentage |  |  |  | 50.00% |  |
Warrant Liability [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Risk free interest rate |  |  |  |  | 1.62% |
Share Price |  | $ 9.75 |  | $ 9.75 |  |
Percentage For Down round financing |  |  |  |  | 0.00% |
Derivative Asset, Noncurrent |  |  | $ 5,100,000 |  | $ 5,100,000 |
Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted Cash Interest Rate |  | 0.10% |  | 0.10% |  |
Maximum | Warrant Liability [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Expected term |  |  |  |  | 3 years 6 months |
Expected volatility rate |  |  |  |  | 39.87% |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted Cash Interest Rate |  | 0.05% |  | 0.05% |  |
Minimum | Warrant Liability [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Expected term |  |  |  |  | 3 years 14 days |
Expected volatility rate |  |  |  |  | 38.72% |
APA ACO [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated Revenue Percentage |  |  |  | 100.00% |  |
Network Medical Management, Inc. [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Dividends Paid |  |  |  | $ 13,783,799 |  |
Network Medical Management, Inc. [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Payments of Dividends | $ 4,216,201 |  |  |  |  |

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