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Available-for-Sale Investments - Summary of Available-for-Sale Securities Held (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 111,090	$ 111,542
Gross unrealized gains	118	5
Gross unrealized losses	(4)	(70)
Fair Value	111,204	111,477
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	36,175	53,549
Gross unrealized gains	30
Gross unrealized losses		(47)
Fair Value	36,205	53,502
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	73,909	54,022
Gross unrealized gains	86	4
Gross unrealized losses	(4)	(23)
Fair Value	73,991	54,003
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,006	3,971
Gross unrealized gains	2	1
Fair Value	$ 1,008	$ 3,972

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- Definition

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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