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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 49,280 | $ 76,831
Total investments fair value | 73,717 | 81,379
Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 24,437 | 4,548
Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 36,002 | 60,567
Total investments fair value | 60,439 | 65,115
Level 1 | Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 24,437 | 4,548
Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 13,278 | 16,264
Total investments fair value | 13,278 | 16,264
U.S. Government Treasury Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 249 | 249
U.S. Government Treasury Securities [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 249 | 249
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 34,416 | 59,371
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 24,497 | 47,489
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 9,919 | 11,882
Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 9,848 | 11,415
Corporate Debt Securities [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 6,489 | 7,033
Corporate Debt Securities [Member] | Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 3,359 | 4,382
Foreign Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 4,767 | 5,796
Foreign Corporate Debt Securities [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 4,767 | $ 5,796

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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 -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: 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=65884222&loc=d3e22054-111558 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 9: 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 + Details
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