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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2017

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 securities at March 31, 2017 and December 31, 2016 were as follows:

		Amortized cost				Gross unrealized holding gains				Gross unrealized holding losses				Estimated fair value
March 31, 2017
Available-for-sale securities:
Corporate bonds and notes		$	19,426			$	73			$	(97	)		$	19,402
Municipal bonds			7,573				9				(20	)			7,562
Total available-for-sale securities		$	26,999			$	82			$	(117	)		$	26,964

		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

Schedule of Maturities of Marketable Securities

Maturities of marketable securities classified as available-for-sale securities were as follows at March 31, 2017:

		Amortized cost				Estimated fair value
March 31, 2017
Due within one year		$	5,857			$	5,862
Due after one year through five years			21,142				21,102
Total available-for-sale securities		$	26,999			$	26,964

Schedule of Available-for-sale Securities

The available-for-sale marketable securities with continuous gross unrealized loss position for less than 12 months and 12 months or greater and their related fair values were as follows:

		Less than 12 months								More than 12 months								Total
(In thousands)		Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses
As of March 31, 2017
Corporate bonds and notes		$	10,664			$	(87	)		$	1,030			$	(10	)		$	11,694			$	(97	)
Municipal bonds			4,981				(20	)			419				—				5,400				(20	)
Total		$	15,645			$	(107	)		$	1,449			$	(10	)		$	17,094			$	(117	)

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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=82896770&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=82897076&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=82896770&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=82897076&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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