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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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 |

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