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Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 15, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Feb. 25, 2015 | Feb. 10, 2014 | May 22, 2012
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Plan Effective Date |  | Mar. 19, 2012 |  |  |  |  |  |
Unearned premiums |  | $ 0 |  | $ 39,000 | [1] |  |  |
Premium deficiency reserves |  | 300,000 |  | 300,000 |  |  |  |
Other assets |  | 4,970,000 |  | 558,000 | [1] |  |  |
Deferred offering costs |  | 4,600,000 |  |  |  |  |  |
Prepaid non-debt related expenses |  | 400,000 |  | 600,000 |  |  |  |
Other liabilities |  | 20,586,000 |  | 16,303,000 | [1] |  |  |
Accrued professional fees |  | 12,300,000 |  | $ 4,700,000 |  |  |  |
Comprehensive income |  | $ 0 |  |  |  |  |  |
Income tax at the federal statutory rate |  | 21.00% |  | 35.00% |  |  |  |
Amount of dividends paid on or after Effective Date |  | $ 0 |  |  |  |  |  |
Preferred stock dividends paid |  | 1,000,000 | $ 9,000,000 |  |  |  |  |
2012 Plan [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  |  | 12,000,000 | 3,000,000 | 2,000,000
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Accrued fees |  | 8,300,000 |  | $ 8,300,000 |  |  |  |
Accrued fees for extension of escrow agreement |  |  |  | 2,500,000 |  |  |  |
Accrued cash dividends |  |  |  | 800,000 |  |  |  |
Additional accrued preferred stock dividends |  | 0 |  | 800,000 |  |  |  |
Common stock issued to satisfy dividends earned, shares | 9,652,268 |  |  |  |  |  |  |
Common stock issued to satisfy dividends earned, value | $ 12,900,000 |  |  |  |  |  |  |
Preferred stock dividends paid |  | $ 1,000,000 |  | $ 18,000,000 |  |  |  |
[1] | Balances derived from audited financial statements as of December 31, 2017.

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