Fair Value Measurements - Available-for-Sale Short-Term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 135,488	$ 149,815
Gross unrealized gains	35	44
Gross unrealized losses	(1,517)	(1,162)
Fair value	134,006	148,697
U.S. Government and sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	59,822	59,824
Gross unrealized gains	0	0
Gross unrealized losses	(773)	(660)
Fair value	59,049	59,164
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	66,529	79,356
Gross unrealized gains	0	0
Gross unrealized losses	(662)	(450)
Fair value	65,867	78,906
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	382	382
Gross unrealized gains	0	0
Gross unrealized losses	(3)	(2)
Fair value	379	380
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	8,545	9,808
Gross unrealized gains	35	44
Gross unrealized losses	(77)	(47)
Fair value	8,503	9,805
Mortgage-backed securities – residential
Debt Securities, Available-for-sale [Line Items]
Amortized cost	210	445
Gross unrealized gains	0	0
Gross unrealized losses	(2)	(3)
Fair value	$ 208	$ 442

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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