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Investments in Marketable Securities (Detail) - Marketable securities - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,744	$ 19,552
Gross Unrealized Gain		2
Gross Unrealized Loss		(7)
Fair Value	2,744	19,547
U.S. Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		807
Fair Value		807
Corporate and other debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,744	18,745
Gross Unrealized Gain		2
Gross Unrealized Loss		(7)
Fair Value	$ 2,744	$ 18,740

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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)
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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.

+ References

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-Publisher FASB
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-Topic 320
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-Section 50
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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