Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail)

v3.21.1
Financial Instruments - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized cost    
Maturing within one year, Amortized cost $ 369,665 $ 434,828
Maturing in one to five years, Amortized cost 64,011 64,221
Total available-for-sale securities, Amortized cost 433,676 499,049
Estimated Fair value    
Maturing within one year, Estimated fair value 369,805 435,023
Maturing in one to five years, Estimated fair value 64,032 64,322
Total available-for-sale securities, Estimated fair value $ 433,837 $ 499,345