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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 76,831 | $ 99,055
Total investments fair value | 81,379 | 106,356
Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 4,548 | 7,301
U.S. Government Treasury Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 249 | 248
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 59,371 | 69,382
Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 11,415 | 21,061
Foreign Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 5,796 | 8,364
Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 60,567 | 75,037
Total investments fair value | 65,115 | 82,338
Level 1 | Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 4,548 | 7,301
Level 1 | U.S. Government Treasury Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 249 | 248
Level 1 | Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 47,489 | 63,909
Level 1 | Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 7,033 | 8,873
Level 1 | Foreign Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 5,796 | 2,007
Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 16,264 | 24,018
Total investments fair value | 16,264 | 24,018
Level 2 | Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 11,882 | 5,473
Level 2 | Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 4,382 | 12,188
Level 2 | Foreign Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value |  | $ 6,357

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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