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Marketable Securities - Summary of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Summary of available-for-sale securities |  |
Available-for-sale securities, Cost | $ 32,691 | $ 32,975
Available-for-sale securities, Estimated Fair Value | 32,719 | 32,815
Level 1 | Certificates of deposit |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 465 | 4,810
Unrecognized losses for more than 12 months, Cost | 0 | 239
Unrecognized gains, Cost | 6,481 | 2,800
Available-for-sale securities, Cost | 6,946 | 7,849
Unrecognized losses for less than 12 months, Estimated Fair value | 464 | 4,797
Unrecognized losses for more than 12 months, Estimated Fair value | 0 | 238
Unrecognized gains, Estimated Fair value | 6,510 | 2,805
Available-for-sale securities, Estimated Fair Value | 6,974 | 7,840
Level 2 | U.S. Treasury and agency notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 0 | 860
Unrecognized losses for more than 12 months, Cost | 0 | 0
Unrecognized gains, Cost | 2,028 | 736
Available-for-sale securities, Cost | 2,028 | 1,596
Unrecognized losses for less than 12 months, Estimated Fair value | 0 | 857
Unrecognized losses for more than 12 months, Estimated Fair value | 0 | 0
Unrecognized gains, Estimated Fair value | 2,037 | 738
Available-for-sale securities, Estimated Fair Value | 2,037 | 1,595
Level 2 | Corporate notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 5,084 | 14,638
Unrecognized losses for more than 12 months, Cost | 3,160 | 2,080
Unrecognized gains, Cost | 11,949 | 3,334
Available-for-sale securities, Cost | 20,193 | 20,052
Unrecognized losses for less than 12 months, Estimated Fair value | 5,056 | 14,516
Unrecognized losses for more than 12 months, Estimated Fair value | 3,139 | 2,061
Unrecognized gains, Estimated Fair value | 11,981 | 3,339
Available-for-sale securities, Estimated Fair Value | 20,176 | 19,916
Level 2 | Municipal notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 666 | 1,742
Unrecognized losses for more than 12 months, Cost | 330 | 301
Unrecognized gains, Cost | 2,528 | 1,435
Available-for-sale securities, Cost | 3,524 | 3,478
Unrecognized losses for less than 12 months, Estimated Fair value | 661 | 1,725
Unrecognized losses for more than 12 months, Estimated Fair value | 329 | 298
Unrecognized gains, Estimated Fair value | 2,542 | 1,441
Available-for-sale securities, Estimated Fair Value | $ 3,532 | $ 3,464

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