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Marketable Securities - Summary of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
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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