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Available-for-Sale Investments - Summary of Available-for-Sale Securities Held (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 100,777	$ 111,542
Gross unrealized gains	116	5
Gross unrealized losses	(4)	(70)
Fair Value	100,889	111,477
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	20,484	53,549
Gross unrealized gains	18
Gross unrealized losses	(1)	(47)
Fair Value	20,501	53,502
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	71,288	54,022
Gross unrealized gains	96	4
Gross unrealized losses	(1)	(23)
Fair Value	71,383	54,003
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	9,005	3,971
Gross unrealized gains	2	1
Gross unrealized losses	(2)
Fair Value	$ 9,005	$ 3,972

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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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