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Available-for-Sale Investments - Summary of Available-for-Sale Securities Held (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 94,052	$ 111,542
Gross unrealized gains	42	5
Gross unrealized losses	(3)	(70)
Fair Value	94,091	111,477
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	90,062	107,571
Gross unrealized gains	42	4
Gross unrealized losses	(3)	(70)
Fair Value	90,101	107,505
U.S. government agency and treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,990
Fair Value	$ 3,990
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		3,971
Gross unrealized gains		1
Fair Value		$ 3,972

X

- 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).

+ References

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-Topic 320
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-Section 50
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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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+ References

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-Publisher FASB
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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).

+ References

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