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)

v3.20.2
Financial Instruments - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Amortized cost    
Maturing within one year, Amortized cost $ 281,771 $ 214,085
Maturing in one to five years, Amortized cost 44,550 42,993
Total available-for-sale securities, Amortized cost 326,321 257,078
Estimated Fair value    
Maturing within one year, Estimated fair value 282,099 214,199
Maturing in one to five years, Estimated fair value 44,749 43,100
Total available-for-sale securities, Estimated fair value $ 326,848 $ 257,299