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Investments in Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Type of Security | Amortized cost and fair value of marketable securities, available-for-sale, by type of security consisted of the following (in thousands):
|  | March 31, 2015 |  |  | December 31, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Type of security – long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency debt securities |  | $ | 7,037 |  |  | $ | 63 |  |  | $ | (7 | ) |  | $ | 7,093 |  |  | $ | 4,993 |  |  | $ | 7 |  |  | $ | (3 | ) |  | $ | 4,997 |
Corporate debt securities |  |  | 13,940 |  |  |  | 252 |  |  |  | (5 | ) |  |  | 14,187 |  |  |  | 7,442 |  |  |  | 48 |  |  |  | (12 | ) |  |  | 7,478 |
Asset-backed securities |  |  | 3,999 |  |  |  | 52 |  |  |  | — |  |  |  | 4,051 |  |  |  | 2,277 |  |  |  | 4 |  |  |  | (4 | ) |  |  | 2,277 |
|  | $ | 24,976 |  |  | $ | 367 |  |  | $ | (12 | ) |  | $ | 25,331 |  |  | $ | 14,712 |  |  | $ | 59 |  |  | $ | (19 | ) |  | $ | 14,752 |
Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Contractual Maturity | Amortized cost and fair value of marketable securities, available-for-sale, by contractual maturity consisted of the following (dollars in thousands):
|  | March 31, 2015 |  |  | December 31, 2014 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 9,797 |  |  |  | 9,877 |  |  |  | 4,679 |  |  |  | 4,679 |
Due after five years through ten years |  |  | 11,771 |  |  |  | 11,961 |  |  |  | 5,652 |  |  |  | 5,662 |
Due after ten years |  |  | 3,408 |  |  |  | 3,493 |  |  |  | 4,381 |  |  |  | 4,411 |
|  | $ | 24,976 |  |  | $ | 25,331 |  |  | $ | 14,712 |  |  | $ | 14,752 |
Weighted average maturity date |  |  | 8.9 years |  |  |  |  |  |  |  | 9.6 years |  |  |  |  |

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