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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments Debt And Equity Securities [Abstract] |
Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Estimated Fair Values of Fixed-Maturity Securities | The amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of total fixed-maturity securities and total fixed-maturity securities held in trust at December 31, 2017, are as follows:
| December 31, 2017 |
Class of securities: | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Obligations of U.S. government sponsored enterprises | $ | 2,249 |  |  | $ | — |  |  | $ | (10 | ) |  | $ | 2,239 |
Corporate debt securities |  | 1,425 |  |  |  | — |  |  |  | (4 | ) |  |  | 1,421 |
Total fixed-maturity securities |  | 3,674 |  |  |  | — |  |  |  | (14 | ) |  |  | 3,660 |
Less total unrestricted fixed-maturity securities |  | 2,151 |  |  |  | — |  |  |  | (9 | ) |  |  | 2,142 |
Total fixed-maturity securities held in trust | $ | 1,523 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 1,518 |
Summary of Net Investment Income | Net investment income for the three and six months ended June 30, 2018 and 2017, respectively, is summarized as follows:
| Three months ended June 30, 2018 |  |  | Three months ended June 30, 2017 |  |  | Six months ended June 30, 2018 |  |  | Six months ended June 30, 2017 |
Investment income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of premium or discount on fixed-maturity securities | $ | (6 | ) |  | $ | (45 | ) |  | $ | (13 | ) |  | $ | (76 | )
Investment income on fixed-maturity securities |  | 1 |  |  |  | 153 |  |  |  | 18 |  |  |  | 331 |
Interest income on cash and cash equivalents |  | 2,878 |  |  |  | 1,618 |  |  |  | 5,149 |  |  |  | 2,632 |
Realized gain (loss) from sale of investments |  | 6 |  |  |  | (25 | ) |  |  | 2 |  |  |  | (27 | )
Unrealized gain on cash equivalents held at period end |  | 163 |  |  |  | — |  |  |  | 58 |  |  |  | — |
Unrealized gain on trading securities held at period end |  | 17 |  |  |  | 2 |  |  |  | 15 |  |  |  | 23 |
Net investment income | $ | 3,059 |  |  | $ | 1,703 |  |  | $ | 5,229 |  |  | $ | 2,883 |
Schedule of Investments in Accordance with Fair Value Measurement | The following table shows how the Company’s investments are categorized in accordance with fair value measurement, as of June 30, 2018:
| June 30, 2018 |
| Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market funds |  | 28,684 |  |  |  | — |  |  |  | — |  |  |  | 28,684 |
Total | $ | 28,684 |  |  | $ | — |  |  | $ | — |  |  | $ | 28,684 |
The following table shows how the Company’s investments are categorized in accordance with fair value measurement, as of December 31, 2017:
| December 31, 2017 |
| Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Class of securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. government sponsored enterprises |  | 995 |  |  |  | 1,244 |  |  |  | — |  |  |  | 2,239 |
Corporate debt securities |  | 1,421 |  |  |  | — |  |  |  | — |  |  |  | 1,421 |
Total fixed-maturity securities |  | 2,416 |  |  |  | 1,244 |  |  |  | — |  |  |  | 3,660 |
Money market funds |  | 30,780 |  |  |  | — |  |  |  | — |  |  |  | 30,780 |
Total | $ | 33,196 |  |  | $ | 1,244 |  |  | $ | — |  |  | $ | 34,440 |
Summary of Transfers between Level 1 and Level 2 |
| January 1, 2018 to June 30, 2018 |  | January 1, 2017 to December 31, 2017 |
| Transfers from Level 1 to Level 2 |  |  | Transfers from Level 2 to Level 1 |  |  | Transfers from Level 1 to Level 2 |  |  | Transfers from Level 2 to Level 1 |
Class of securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of US government sponsored enterprises | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 995 |
Corporate debt securities |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,421 |
Total transfers | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,416 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition Fair value transfers between level one and level two. + References No definition available. + Details
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