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Available-for-Sale Investments - Summary of Available-for-Sale Securities Held (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 94,741	$ 100,777
Gross unrealized gains	104	116
Gross unrealized losses	(49)	(4)
Fair Value	94,796	100,889
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	16,356	20,484
Gross unrealized gains	48	18
Gross unrealized losses		(1)
Fair Value	16,404	20,501
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	70,882	71,288
Gross unrealized gains	45	96
Gross unrealized losses	(49)	(1)
Fair Value	70,878	71,383
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	7,503	9,005
Gross unrealized gains	11	2
Gross unrealized losses		(2)
Fair Value	$ 7,514	$ 9,005

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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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