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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Maturities of Marketable Securities Available-for-Sale (Detail) $ in Thousands	Dec. 31, 2020 USD ($)
Amortized Cost
Mature in one year or less	$ 122,156
Mature after one year through two years	10,776
Total amortized cost	132,932
Estimated Fair Value
Mature in one year or less	122,181
Mature after one year through two years	10,782
Total estimated fair value	$ 132,963

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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).

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