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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |  |
Schedule of Investments in Fixed Maturity Securities | At December 31, 2017, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:
(in thousands) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | $ | 29,970 |  |  | $ | — |  |  | $ | (206 | ) |  | $ | 29,764 |
Corporate debt | 1,072 |  |  | 12 |  |  | — |  |  | 1,084 |
Total | $ | 31,042 |  |  | $ | 12 |  |  | $ | (206 | ) |  | $ | 30,848 |
At December 31, 2017, the Company held $30.0 million in fixed income securities composed of U.S Treasury securities, securities issued by U.S. Government agencies and Municipalities, and $1.1 million issued by corporations with investment-grade ratings. Of the total, $16.9 million is classified as short-term investments on the Consolidated Balance Sheet as maturities are less than one year in duration. Additionally, the Company holds $8.1 million in short-term investments, which are related to time deposits held with various financial institutions. | At December 31, 2016, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:
(in thousands) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | $ | 26,280 |  |  | $ | 11 |  |  | $ | (59 | ) |  | $ | 26,232 |
Corporate debt | 2,358 |  |  | 13 |  |  | (1 | ) |  | 2,370 |
Total | $ | 28,638 |  |  | $ | 24 |  |  | $ | (60 | ) |  | $ | 28,602 |
Summary of Unrealized Loss Position | For securities in a loss position, the following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2017:
(in thousands) | Less than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | $ | 17,919 |  |  | $ | (157 | ) |  | $ | 11,845 |  |  | $ | (49 | ) |  | $ | 29,764 |  |  | $ | (206 | )
Corporate debt | 400 |  |  | — |  |  | — |  |  | — |  |  | 400 |  |  | — |
Total | $ | 18,319 |  |  | $ | (157 | ) |  | $ | 11,845 |  |  | $ | (49 | ) |  | $ | 30,164 |  |  | $ | (206 | )
| The following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2016:
(in thousands) | Less than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | $ | 14,663 |  |  | $ | (59 | ) |  | $ | — |  |  | $ | — |  |  | $ | 14,663 |  |  | $ | (59 | )
Corporate debt | 1,001 |  |  | (1 | ) |  | — |  |  | — |  |  | 1,001 |  |  | (1 | )
Total | $ | 15,664 |  |  | $ | (60 | ) |  | $ | — |  |  | $ | — |  |  | $ | 15,664 |  |  | $ | (60 | )
Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity | The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2017 by contractual maturity are set forth below:
(in thousands) | Amortized Cost |  | Fair Value
Years to maturity: |  |  |
Due in one year or less | $ | 16,934 |  |  | $ | 16,899 |
Due after one year through five years | 13,876 |  |  | 13,708 |
Due after five years through ten years | 232 |  |  | 241 |
Total | $ | 31,042 |  |  | $ | 30,848 |
| The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2016 by contractual maturity are set forth below:
(in thousands) | Amortized Cost |  | Fair Value
Years to maturity: |  |  |
Due in one year or less | $ | 5,551 |  |  | $ | 5,554 |
Due after one year through five years | 22,757 |  |  | 22,708 |
Due after five years through ten years | 330 |  |  | 340 |
Total | $ | 28,638 |  |  | $ | 28,602 |

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