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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at December 31, 2016 and 2015 were as follows:

		Amortized cost				Gross unrealized holding gains				Gross unrealized holding losses				Estimated fair value
December 31, 2016
Available-for-sale securities:
Corporate bonds and notes		$	20,028			$	64			$	(122	)		$	19,970
Municipal bonds			6,463				6				(44	)			6,425
Total available-for-sale securities		$	26,491			$	70			$	(166	)		$	26,395
December 31, 2015
Available-for-sale securities:
Corporate bonds and notes		$	20,827			$	50			$	(133	)		$	20,744
Municipal bonds			5,608				18				(5	)			5,621
Total available-for-sale securities		$	26,435			$	68			$	(138	)		$	26,365

Schedule of Maturities of Marketable Securities

Maturities of marketable securities classified as available-for-sale securities were as follows at December 31, 2016:

		Amortized				Estimated
		cost				fair value
Due within one year		$	5,029			$	5,030
Due after one year through five years			21,353				21,256
Due after five years through ten years			109				109
Total available-for-sale securities		$	26,491			$	26,395

Schedule of Available-for-sale Securities

The available-for-sale marketable securities in a gross unrealized loss position as of December 31, 2016 are summarized as follows:

		Less than 12 months								More than 12 months								Total
		Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses
As of December 31, 2016
Corporate bonds and notes		$	10,294			$	(112	)			1,029			$	(9	)		$	11,323			$	(121	)
Municipal bonds			3,910				(45	)			—				—				3,910				(45	)
		$	14,204			$	(157	)		$	1,029			$	(9	)		$	15,233			$	(166	)

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Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.

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Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2,12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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