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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
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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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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