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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale - matures within one year, Amortized cost | $ 9,016 | $ 11,803
Available-for-sale - matures within one year through five years, Amortized cost | 77,558 | 71,539
Amortized cost, Total | 86,574 | 83,342
Available-for-sale - matures within one year, Gross unrealized gains |  | 3
Available-for-sale - matures after one year through five years, Gross unrealized gains | 37 | 14
Gross unrealized gains, Total | 37 | 17
Available-for-sale - matures within one year, Gross unrealized losses | (20) | (12)
Available-for-sale - matures after one year through five years, Gross unrealized losses | (1,379) | (683)
Gross unrealized losses, Total | (1,399) | (695)
Available-for-sale - matures within one year, Fair value | 8,996 | 11,794
Available-for-sale - matures after one year through five years, Fair value | 76,216 | 70,870
Fair value, Total | 85,212 | 82,664
Certificates of deposits |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale - matures within one year through five years, Amortized cost | 747 | 747
Available-for-sale - matures after one year through five years, Fair value | 747 | 747
Fair value, Total | 747 | 747
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale - matures within one year, Amortized cost | 9,016 | 11,803
Available-for-sale - matures within one year through five years, Amortized cost | 76,310 | 70,291
Available-for-sale - matures within one year, Gross unrealized gains |  | 3
Available-for-sale - matures after one year through five years, Gross unrealized gains | 37 | 14
Available-for-sale - matures within one year, Gross unrealized losses | (20) | (12)
Available-for-sale - matures after one year through five years, Gross unrealized losses | (1,369) | (677)
Available-for-sale - matures within one year, Fair value | 8,996 | 11,794
Available-for-sale - matures after one year through five years, Fair value | 74,978 | 69,628
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 | (10) | (6)
Available-for-sale - matures after one year through five years, Fair value | 491 | 495
Fair value, Total | $ 491 | $ 495

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