Marketable Securities - Schedule of Available-for-sale Securities (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Less than 12 Months - Estimated Fair Value	$ 14,204
Less than 12 Months - Gross Unrealized Holding Losses	(157)
More than 12 Months - Estimated Fair Value	1,029
More than 12 Months - Gross Unrealized Holding Losses	(9)
Total Estimated Fair Value	15,233
Total Gross Unrealized Holding Losses	(166)
Corporate Bonds and Notes [Member]
Less than 12 Months - Estimated Fair Value	10,294
Less than 12 Months - Gross Unrealized Holding Losses	(112)
More than 12 Months - Estimated Fair Value	1,029
More than 12 Months - Gross Unrealized Holding Losses	(9)
Total Estimated Fair Value	11,323
Total Gross Unrealized Holding Losses	(121)
Municipal Bonds [Member]
Less than 12 Months - Estimated Fair Value	3,910
Less than 12 Months - Gross Unrealized Holding Losses	(45)
More than 12 Months - Estimated Fair Value
More than 12 Months - Gross Unrealized Holding Losses
Total Estimated Fair Value	3,910
Total Gross Unrealized Holding Losses	$ (45)

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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