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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale-matures within one year, Amortized cost | $ 11,803 | $ 9,456
Available-for-sale-matures within one year through five years, Amortized cost | 71,539 | 52,991
Amortized cost, Total | 83,342 | 62,447
Available-for-sale-matures within one year, Gross unrealized gains | 3 | 4
Available-for-sale-matures after one year through five years, Gross unrealized gains | 14 | 3
Gross unrealized gains, Total | 17 | 7
Available-for-sale-matures within one year, Gross unrealized losses | (12) | (15)
Available-for-sale-matures after one year through five years, Gross unrealized losses | (683) | (571)
Gross unrealized losses, Total | (695) | (586)
Available-for-sale-matures within one year, Fair value | 11,794 | 9,445
Available-for-sale-matures after one year through five years, Fair value | 70,870 | 52,423
Fair value, Total | 82,664 | 61,868
Certificates of deposits |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale-matures within one year through five years, Amortized cost | 747 |
Available-for-sale-matures after one year through five years, Fair value | 747 |
Fair value, Total | 747 |
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale-matures within one year, Amortized cost | 11,803 | 9,456
Available-for-sale-matures within one year through five years, Amortized cost | 70,291 | 52,490
Available-for-sale-matures within one year, Gross unrealized gains | 3 | 4
Available-for-sale-matures after one year through five years, Gross unrealized gains | 14 | 3
Available-for-sale-matures within one year, Gross unrealized losses | (12) | (15)
Available-for-sale-matures after one year through five years, Gross unrealized losses | (677) | (567)
Available-for-sale-matures within one year, Fair value | 11,794 | 9,445
Available-for-sale-matures after one year through five years, Fair value | 69,628 | 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 | (6) | (4)
Available-for-sale-matures after one year through five years, Fair value | 495 | 497
Fair value, Total | $ 495 | $ 497

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