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Available-for-Sale Investments - Summary of Available-for-Sale Securities Held (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 111,542	$ 28,593
Gross unrealized gains	5	1
Gross unrealized losses	(70)	(9)
Fair Value	111,477	28,585
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	107,571	28,593
Gross unrealized gains	4	1
Gross unrealized losses	(70)	(9)
Fair Value	107,505	$ 28,585
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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-Publisher FASB
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-Topic 320
-SubTopic 10
-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).

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