Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Financial Instruments - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized cost    
Maturing within one year, Amortized cost $ 434,828 $ 214,085
Maturing in one to five years, Amortized cost 64,221 42,993
Total available-for-sale securities, Amortized cost 499,049 257,078
Estimated Fair value    
Maturing within one year, Estimated fair value 435,023 214,199
Maturing in one to five years, Estimated fair value 64,322 43,100
Total available-for-sale securities, Estimated fair value $ 499,345 $ 257,299