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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale-matures within one year, Amortized cost | $ 9,258 | $ 5,443
Available-for-sale-matures within one year through three years, Amortized cost | 39,501 | 42,810
Amortized cost, Total | 48,759 | 48,253
Available-for-sale-matures within one year, Gross unrealized gains | 1 |
Available-for-sale-matures after one year through three years, Gross unrealized gains |  | 9
Gross unrealized gains, Total | 1 | 9
Available-for-sale-matures within one year, Gross unrealized losses | (50) | (46)
Available-for-sale-matures after one year through three years, Gross unrealized losses | (444) | (383)
Gross unrealized losses, Total | (494) | (429)
Available-for-sale-matures within one year, Fair value | 9,209 | 5,397
Available-for-sale-matures after one year through three years, Fair value | 39,057 | 42,436
Fair value, Total | 48,266 | 47,833
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 through three years, Amortized cost |  | 1,975
Available-for-sale-matures within one year, Fair value | 1 |
Available-for-sale-matures after one year through three years, Fair value |  | 1,975
Fair value, Total | 1 | 1,975
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale-matures within one year, Amortized cost | 9,257 | 5,443
Available-for-sale-matures within one year through three years, Amortized cost | 39,501 | 40,835
Available-for-sale-matures within one year, Gross unrealized gains | 1 |
Available-for-sale-matures after one year through three years, Gross unrealized gains |  | 9
Available-for-sale-matures within one year, Gross unrealized losses | (50) | (46)
Available-for-sale-matures after one year through three years, Gross unrealized losses | (444) | (383)
Available-for-sale-matures within one year, Fair value | 9,208 | 5,397
Available-for-sale-matures after one year through three years, Fair value | $ 39,057 | $ 40,461

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