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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2016
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 March 31, 2016, are as follows:
| March 31, 2016 |
Class of securities: | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
U.S. government treasury securities | $ | 249 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 250 |
Obligations of U.S. government sponsored enterprises |  | 68,453 |  |  |  | 21 |  |  |  | (1 | ) |  |  | 68,473 |
Corporate debt securities |  | 20,946 |  |  |  | 93 |  |  |  | (10 | ) |  |  | 21,029 |
Foreign corporate debt securities |  | 8,380 |  |  |  | 11 |  |  |  | (17 | ) |  |  | 8,374 |
Total fixed-maturity securities |  | 98,028 |  |  |  | 126 |  |  |  | (28 | ) |  |  | 98,126 |
Less total unrestricted fixed-maturity securities |  | 66,522 |  |  |  | 21 |  |  |  | (2 | ) |  |  | 66,541 |
Total fixed-maturity securities held in trust | $ | 31,506 |  |  | $ | 105 |  |  | $ | (26 | ) |  | $ | 31,585 |
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, 2015, are as follows:
| December 31, 2015 |
Class of securities: | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
U.S. government treasury securities | $ | 249 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 248 |
Obligations of U.S. government sponsored enterprises |  | 69,392 |  |  |  | 13 |  |  |  | (23 | ) |  |  | 69,382 |
Corporate debt securities |  | 21,048 |  |  |  | 62 |  |  |  | (49 | ) |  |  | 21,061 |
Foreign corporate debt securities |  | 8,399 |  |  |  | 3 |  |  |  | (38 | ) |  |  | 8,364 |
Total fixed-maturity securities |  | 99,088 |  |  |  | 78 |  |  |  | (111 | ) |  |  | 99,055 |
Less total unrestricted fixed-maturity securities |  | 66,481 |  |  |  | 14 |  |  |  | (11 | ) |  |  | 66,484 |
Total fixed-maturity securities held in trust | $ | 32,607 |  |  | $ | 64 |  |  | $ | (100 | ) |  | $ | 32,571 |
Schedule of Amortized Cost and Estimated Fair Value of Fixed-Maturity Securities by Contractual Maturity | Amortized cost and estimated fair value of fixed-maturity securities at March 31, 2016 by contractual maturity are as follows:
| Amortized Cost |  |  | Estimated Fair Value |
Maturity in: |  |  |  |  |  |  |
2016 | $ | 74,792 |  |  | $ | 74,820 |
2017-2019 |  | 23,236 |  |  |  | 23,306 |
Total fixed-maturity securities | $ | 98,028 |  |  | $ | 98,126 |
Summary of Net Investment Income | Net investment income for the periods ended March 31, 2016 and 2015, respectively, is summarized as follows:
| Three months ended March 31, 2016 |  |  | Three months ended March 31, 2015 |
Investment income: |  |  |  |  |  |  |
Amortization of premium or discount on fixed-maturity securities | $ | (122 | ) |  | $ | (179 | )
Investment income on fixed-maturity securities |  | 318 |  |  |  | 413 |
Interest income on cash and cash equivalents |  | 328 |  |  |  | 57 |
Realized net (loss) gain from sale of investments |  | (4 | ) |  |  | 186 |
Unrealized gain (loss) on trading securities held at period end |  | 131 |  |  |  | (76 | )
Net investment income | $ | 651 |  |  | $ | 401 |
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 March 31, 2016:
| March 31, 2016 |
| Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Class of securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasury securities | $ | 250 |  |  | $ | — |  |  | $ | — |  |  | $ | 250 |
Obligations of U.S. government sponsored enterprises |  | 63,974 |  |  |  | 4,499 |  |  |  | — |  |  |  | 68,473 |
Corporate debt securities |  | 12,007 |  |  |  | 9,022 |  |  |  | — |  |  |  | 21,029 |
Foreign corporate debt securities |  | 2,510 |  |  |  | 5,864 |  |  |  | — |  |  |  | 8,374 |
Total fixed-maturity securities |  | 78,741 |  |  |  | 19,385 |  |  |  | — |  |  |  | 98,126 |
Money market funds |  | 3,286 |  |  |  | — |  |  |  | — |  |  |  | 3,286 |
Total | $ | 82,027 |  |  | $ | 19,385 |  |  | $ | — |  |  | $ | 101,412 |
The following table shows how the Company’s investments are categorized in accordance with fair value measurement, as of December 31, 2015:
| December 31, 2015 |
| Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Class of securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasury securities | $ | 248 |  |  | $ | — |  |  | $ | — |  |  | $ | 248 |
Obligations of U.S. government sponsored enterprises |  | 63,909 |  |  |  | 5,473 |  |  |  | — |  |  |  | 69,382 |
Corporate debt securities |  | 8,873 |  |  |  | 12,188 |  |  |  | — |  |  |  | 21,061 |
Foreign corporate debt securities |  | 2,007 |  |  |  | 6,357 |  |  |  | — |  |  |  | 8,364 |
Total fixed-maturity securities |  | 75,037 |  |  |  | 24,018 |  |  |  | — |  |  |  | 99,055 |
Money market funds |  | 7,301 |  |  |  | — |  |  |  | — |  |  |  | 7,301 |
Total | $ | 82,338 |  |  | $ | 24,018 |  |  | $ | — |  |  | $ | 106,356 |
Summary of Transfers between Level 1 and Level 2 |
| January 1, 2016 to March 31, 2016 |  | January 1, 2014 to December 31, 2015 |
| 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | $ | — |  |  | $ | 3,168 |  |  | $ | — |  |  | $ | 7,860 |
Foreign corporate debt securities |  | — |  |  |  | 502 |  |  |  | — |  |  |  | 2,007 |
Total transfers | $ | — |  |  | $ | 3,670 |  |  | $ | — |  |  | $ | 9,867 |

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