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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 99,055 | $ 60,641
Total investments fair value | 106,356 | 149,492
Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 7,301 | 88,851
Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 75,037 | 20,770
Total investments fair value | 82,338 | 109,621
Level 1 | Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 7,301 | 88,851
Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 24,018 | 39,871
Total investments fair value | 24,018 | 39,871
U.S. Government Treasury Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 248 |
U.S. Government Treasury Securities [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 248 |
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 69,382 | 6,475
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 63,909 | 3,009
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 5,473 | 3,466
Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 21,061 | 41,484
Corporate Debt Securities [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 8,873 | 14,939
Corporate Debt Securities [Member] | Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 12,188 | 26,545
Foreign Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 8,364 | 12,682
Foreign Corporate Debt Securities [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 2,007 | 2,822
Foreign Corporate Debt Securities [Member] | Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 6,357 | $ 9,860

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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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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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