Annual report pursuant to Section 13 and 15(d)

Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Parenthetical) (Detail)

v3.20.4
Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Parenthetical) (Detail) - Level I - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash equivalents $ 1,398 $ 1,392
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash equivalents $ 1,398 $ 1,392