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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 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 |
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, 2014, are as follows:
| December 31, 2014 |
Class of securities: | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Obligations of U.S. government sponsored enterprises | $ | 6,491 |  |  | $ | 12 |  |  | $ | (28 | ) |  | $ | 6,475 |
Corporate debt securities |  | 41,018 |  |  |  | 531 |  |  |  | (65 | ) |  |  | 41,484 |
Foreign corporate debt securities |  | 12,693 |  |  |  | 47 |  |  |  | (58 | ) |  |  | 12,682 |
Total fixed-maturity securities |  | 60,202 |  |  |  | 590 |  |  |  | (151 | ) |  |  | 60,641 |
Less total unrestricted fixed-maturity securities |  | 7,895 |  |  |  | 179 |  |  |  | (11 | ) |  |  | 8,063 |
Total fixed-maturity securities held in trust | $ | 52,307 |  |  | $ | 411 |  |  | $ | (140 | ) |  | $ | 52,578 |
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 December 31, 2015 by contractual maturity are as follows:
| Amortized Cost |  |  | Estimated Fair Value |
Maturity in: |  |  |  |  |  |  |
2016 | $ | 74,767 |  |  | $ | 74,789 |
2017-2019 |  | 24,321 |  |  |  | 24,266 |
Total fixed-maturity securities | $ | 99,088 |  |  | $ | 99,055 |
Summary of Net Investment Income (Loss) | Net investment income (loss) for the periods ended December 31, 2015, 2014 and 2013, respectively, is summarized as follows:
| Year ended December 31, 2015 |  |  | Year ended December 31, 2014 |  |  | Year ended December 31, 2013 |
Investment income (loss): |  |  |  |  |  |  |  |  |  |  |
Amortization of premium or discount on fixed-maturity securities | $ | (574 | ) |  | $ | (1,663 | ) |  | $ | (2,309 | )
Investment income on fixed-maturity securities |  | 1,324 |  |  |  | 3,369 |  |  |  | 6,588 |
Interest income on cash and cash equivalents |  | 268 |  |  |  | 11 |  |  |  | 10 |
Realized net gain (loss) from sale of investments |  | 324 |  |  |  | 436 |  |  |  | (1,575 | )
Unrealized (losses) on trading securities held at period end |  | (463 | ) |  |  | (774 | ) |  |  | (3,492 | )
Net investment income (loss) | $ | 879 |  |  | $ | 1,379 |  |  | $ | (778 | )
Schedule of Investments in Accordance with Fair Value Measurement | The following tables show how the Company’s investments are categorized in accordance with fair value measurement, as of December 31, 2015 and 2014, respectively:
| 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 |
| December 31, 2014 |
| Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Class of securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. government sponsored enterprises | $ | 3,009 |  |  | $ | 3,466 |  |  | $ | — |  |  | $ | 6,475 |
Corporate debt securities |  | 14,939 |  |  |  | 26,545 |  |  |  | — |  |  |  | 41,484 |
Foreign corporate debt securities |  | 2,822 |  |  |  | 9,860 |  |  |  | — |  |  |  | 12,682 |
Total fixed-maturity securities |  | 20,770 |  |  |  | 39,871 |  |  |  | — |  |  |  | 60,641 |
Money market funds |  | 88,851 |  |  |  | — |  |  |  | — |  |  |  | 88,851 |
Total | $ | 109,621 |  |  | $ | 39,871 |  |  | $ | — |  |  | $ | 149,492 |
Summary of Transfers between Level 1 and Level 2 |
|  | 2015 |  |  | 2014 |
|  | 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 securities |  | $ | — |  |  | $ | 7,860 |  |  | $ | — |  |  | $ | 13,941 |
Foreign corporate debt securities |  |  | — |  |  |  | 2,007 |  |  |  | — |  |  |  | 1,810 |
Total Transfers |  | $ | — |  |  | $ | 9,867 |  |  | $ | — |  |  | $ | 15,751 |

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