Fair Value Measurements - Amortized Cost and Estimated Fair Value of Investments (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Fair Value Disclosures [Abstract]
Mature in less than one year, Amortized cost	$ 70,811
Mature in one to three years, Amortized cost	31,538
Amortized Cost	102,349
Mature in less than one year, Fair value	70,811
Mature in one to three years, Fair value	31,538
Total short-term investments, Fair value	$ 102,349

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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- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563

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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.

+ 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), 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563

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-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

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- References

No definition available.

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