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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Available-for-sale - matures within one year, Amortized cost	$ 8,538	$ 11,803
Available-for-sale - matures within one year through five years, Amortized cost	71,756	71,539
Amortized cost, Total	80,294	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	1	14
Gross unrealized gains, Total	1	17
Available-for-sale - matures within one year, Gross unrealized losses	(49)	(12)
Available-for-sale - matures after one year through five years, Gross unrealized losses	(1,463)	(683)
Gross unrealized losses, Total	(1,512)	(695)
Available-for-sale - matures within one year, Fair value	8,489	11,794
Available-for-sale - matures after one year through five years, Fair value	70,294	70,870
Fair value, Total	78,783	82,664
Certificates of deposits
Debt Securities, Available-for-sale [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
Debt Securities, Available-for-sale [Line Items]
Available-for-sale - matures within one year, Amortized cost	8,538	11,803
Available-for-sale - matures within one year through five years, Amortized cost	70,508	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	1	14
Available-for-sale - matures within one year, Gross unrealized losses	(49)	(12)
Available-for-sale - matures after one year through five years, Gross unrealized losses	(1,452)	(677)
Available-for-sale - matures within one year, Fair value	8,489	11,794
Available-for-sale - matures after one year through five years, Fair value	69,057	69,628
Government bonds
Debt Securities, Available-for-sale [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	(11)	(6)
Available-for-sale - matures after one year through five years, Fair value	490	495
Fair value, Total	$ 490	$ 495

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