Fair Value Measurements - Amortized Cost and Estimated Fair Value (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
Amortized cost
Mature in less than one year	$ 78,377
Mature in one to three years	57,111
Total short-term investments	135,488
Fair value
Mature in less than one year	77,843
Mature in one to three years	56,163
Total short-term investments	$ 134,006

Available-for-sale securities debt maturities, after one through three years, amortized cost.

No definition available.

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- Definition

Available-for-sale securities debt maturities, after one through three years, fair value.

+ References

No definition available.

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- References

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- References

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- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.

+ References

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

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