Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	$ 9,456	$ 9,258
Available-for-sale-matures within one year through three years, Amortized cost		39,501
Available-for-sale-matures after one year through three years, Gross unrealized gains		0
Available-for-sale-matures after one year through three years, Gross unrealized losses		(444)
Available-for-sale-matures after one year through three years, Fair value		39,057
Available-for-sale-matures within one year through five years, Amortized cost	52,991
Amortized cost, Total	62,447	48,759
Available-for-sale-matures within one year, Gross unrealized gains	4	1
Available-for-sale-matures after one year through five years, Gross unrealized gains	3
Gross unrealized gains, Total	7	1
Available-for-sale-matures within one year, Gross unrealized losses	(15)	(50)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(571)
Gross unrealized losses, Total	(586)	(494)
Available-for-sale-matures within one year, Fair value	9,445	9,209
Available-for-sale-matures after one year through five years, Fair value	52,423
Fair value, Total	61,868	48,266
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost		1
Available-for-sale-matures within one year, Fair value		1
Fair value, Total		1
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	9,456	9,257
Available-for-sale-matures within one year through three years, Amortized cost		39,501
Available-for-sale-matures after one year through three years, Gross unrealized gains		0
Available-for-sale-matures after one year through three years, Gross unrealized losses		(444)
Available-for-sale-matures after one year through three years, Fair value		39,057
Available-for-sale-matures within one year through five years, Amortized cost	52,490
Available-for-sale-matures within one year, Gross unrealized gains	4	1
Available-for-sale-matures after one year through five years, Gross unrealized gains	3
Available-for-sale-matures within one year, Gross unrealized losses	(15)	(50)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(567)
Available-for-sale-matures within one year, Fair value	9,445	$ 9,208
Available-for-sale-matures after one year through five years, Fair value	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
Available-for-sale-matures after one year through five years, Gross unrealized losses	(4)
Available-for-sale-matures after one year through five years, Fair value	497
Fair value, Total	$ 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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Available for sale matures after one year through three years, gross unrealized gains.

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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

Available for sale securities debt maturities rolling year two through three amortized cost basis.

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Available for sale securities debt maturities rolling year two through three fair value.

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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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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

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-Publisher FASB
-Name Accounting Standards Codification
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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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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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-Paragraph 3
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-Name Accounting Standards Codification
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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