Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	$ 11,565	$ 9,456
Available-for-sale-matures within one year through five years, Amortized cost	53,062	52,991
Amortized cost, Total	64,627	62,447
Available-for-sale-matures within one year, Gross unrealized gains	6	4
Available-for-sale-matures after one year through five years, Gross unrealized gains	29	3
Gross unrealized gains, Total	35	7
Available-for-sale-matures within one year, Gross unrealized losses	(23)	(15)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(384)	(571)
Gross unrealized losses, Total	(407)	(586)
Available-for-sale-matures within one year, Fair value	11,548	9,445
Available-for-sale-matures after one year through five years, Fair value	52,707	52,423
Fair value, Total	64,255	61,868
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	11,565	9,456
Available-for-sale-matures within one year through five years, Amortized cost	52,561	52,490
Available-for-sale-matures within one year, Gross unrealized gains	6	4
Available-for-sale-matures after one year through five years, Gross unrealized gains	29	3
Available-for-sale-matures within one year, Gross unrealized losses	(23)	(15)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(377)	(567)
Available-for-sale-matures within one year, Fair value	11,548	9,445
Available-for-sale-matures after one year through five years, Fair value	52,213	51,926
Government bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year through five years, Amortized cost	501	501
Available-for-sale-matures after one year through five years, Gross unrealized losses	(7)	(4)
Available-for-sale-matures after one year through five years, Fair value	494	497
Fair value, Total	$ 494	$ 497

Available for sale matures after one year through five years gross unrealized gains.

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Available for sale matures after one year through five years gross unrealized loss.

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No definition available.

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- Definition

Available for sale matures within one year, gross unrealized gains.

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Available For Sale Matures Within One Year Gross Unrealized Loss

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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.

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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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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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 (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

Reference 2: 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the second through fifth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second through fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
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-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

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-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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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