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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 3,153 | $ 3,660
Total investments fair value | 31,837 | 34,440
Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 28,684 | 30,780
Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 1,908 | 2,416
Total investments fair value | 30,592 | 33,196
Level 1 | Money Market Funds [Member] |  |
Class of securities: |  |
Money market funds | 28,684 | 30,780
Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 1,245 | 1,244
Total investments fair value | 1,245 | 1,244
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 2,242 | 2,239
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 997 | 995
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 2 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 1,245 | 1,244
Corporate Debt Securities [Member] |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | 911 | 1,421
Corporate Debt Securities [Member] | Level 1 |  |
Class of securities: |  |
Total fixed-maturity securities, Estimated Fair Value | $ 911 | $ 1,421

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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 No definition available. + 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 -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 3: 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=82895926&loc=d3e24584-111560 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 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 6: 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=75030427&loc=d3e22054-111558 Reference 7: 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 + Details
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