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Marketable Securities - Summary of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Summary of available-for-sale securities |  |
Available-for-sale securities, Cost | $ 39,318 | $ 42,112
Available-for-sale securities, Estimated Fair Value | 39,289 | 42,140
Level 1 | Certificates of deposit |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 3,925 | 2,522
Unrecognized losses for more than 12 months, Cost | 620 | 837
Unrecognized gains, Cost | 3,789 | 5,379
Available-for-sale securities, Cost | 8,334 | 8,738
Unrecognized losses for less than 12 months, Estimated Fair value | 3,899 | 2,492
Unrecognized losses for more than 12 months, Estimated Fair value | 619 | 832
Unrecognized gains, Estimated Fair value | 3,798 | 5,395
Available-for-sale securities, Estimated Fair Value | 8,316 | 8,719
Level 2 | U.S. Treasury and agency notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 723 | 1,919
Unrecognized losses for more than 12 months, Cost | 200 | 702
Unrecognized gains, Cost | 1,764 | 1,182
Available-for-sale securities, Cost | 2,687 | 3,803
Unrecognized losses for less than 12 months, Estimated Fair value | 720 | 1,910
Unrecognized losses for more than 12 months, Estimated Fair value | 200 | 700
Unrecognized gains, Estimated Fair value | 1,790 | 1,207
Available-for-sale securities, Estimated Fair Value | 2,710 | 3,817
Level 2 | Corporate notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 8,049 | 3,872
Unrecognized losses for more than 12 months, Cost | 2,520 | 4,423
Unrecognized gains, Cost | 12,893 | 16,897
Available-for-sale securities, Cost | 23,462 | 25,192
Unrecognized losses for less than 12 months, Estimated Fair value | 7,996 | 3,841
Unrecognized losses for more than 12 months, Estimated Fair value | 2,507 | 4,405
Unrecognized gains, Estimated Fair value | 12,934 | 16,963
Available-for-sale securities, Estimated Fair Value | 23,437 | 25,209
Level 2 | Municipal notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 1,532 | 739
Unrecognized losses for more than 12 months, Cost | 641 | 457
Unrecognized gains, Cost | 2,662 | 3,183
Available-for-sale securities, Cost | 4,835 | 4,379
Unrecognized losses for less than 12 months, Estimated Fair value | 1,518 | 733
Unrecognized losses for more than 12 months, Estimated Fair value | 634 | 456
Unrecognized gains, Estimated Fair value | 2,674 | 3,206
Available-for-sale securities, Estimated Fair Value | $ 4,826 | $ 4,395

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