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Investments in Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 19,326
Gross Unrealized Gain		7
Gross Unrealized Loss		(18)
Fair Value		19,315
Marketable securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 20,982	17,688
Gross Unrealized Gain	79	7
Gross Unrealized Loss	(1)	(13)
Fair Value	21,060	17,682
Marketable securities | U.S. Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,016	7,029
Gross Unrealized Gain	1
Gross Unrealized Loss		(6)
Fair Value	2,017	7,023
Marketable securities | Corporate and other debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,966	10,659
Gross Unrealized Gain	78	7
Gross Unrealized Loss	(1)	(7)
Fair Value	$ 19,043	10,659
Long-term marketable securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,638
Gross Unrealized Loss		(5)
Fair Value		1,633
Long-term marketable securities | U.S. Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		838
Gross Unrealized Loss		(2)
Fair Value		836
Long-term marketable securities | Corporate and other debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		800
Gross Unrealized Loss		(3)
Fair Value		$ 797

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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-Publisher FASB
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 320
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-Publisher FASB
-Name Accounting Standards Codification
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