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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 09, 2017 | Mar. 16, 2016 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2016
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash, Uninsured Amount |  |  |  | $ 32,900,000 |  |
Cash, FDIC Insured Amount |  |  |  | 250,000 |  |
Amortization of Debt Issuance Costs |  |  |  | 107,000 | $ 38,000 |
Subsequent Event [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Payment Of Revenue | $ 9,300,000 |  |  |  |  |
Professional Stop Loss [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Health Care Organization, Patient Service Revenue |  |  |  | 20,000 |  |
Medi-Cal Patients Stop Loss [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Health Care Organization, Patient Service Revenue |  |  |  | $ 200,000 |  |
Warrant Liability [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Risk free interest rate |  | 1.13% |  |  | 0.99% |
Expected volatility rate |  | 65.70% |  |  | 61.70% |
Share Price |  |  |  |  | $ 4.50 | $ 5.93
Percentage For Down round financing |  | 0.00% |  |  |  |
Financial Liabilities Fair Value Disclosure |  |  |  |  | $ 1,500,000 | $ 2,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  | 4 years 6 months |  |  | 4 years 14 days |
Warrant [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  |  |  | $ 1,333,333 |
Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Management agreement, initial term |  |  |  | 20 years |  |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Management agreement, initial term |  |  |  | 10 years |  |
APA ACO [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase In Government Revenue |  |  | $ 55,700,000 |  |  |
Estimated Revenue Percentage |  |  |  | 100.00% |  |

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