Fair Value Measurements - Available-for-Sale Short-Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 102,349	$ 149,815
Gross Unrealized Gains	0	44
Gross Unrealized Losses	0	(1,162)
Fair value	102,349	148,697
U.S. Government and sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50,329	59,824
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(660)
Fair value	50,329	59,164
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,434	79,356
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(450)
Fair value	47,434	78,906
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	379	382
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Fair value	379	380
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,091	9,808
Gross Unrealized Gains	0	44
Gross Unrealized Losses	0	(47)
Fair value	4,091	9,805
Mortgage-backed securities – residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	116	445
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(3)
Fair value	$ 116	$ 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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