Annual report pursuant to Section 13 and 15(d)

Financial Instruments and Risk - Additional Information (Detail)

v3.20.1
Financial Instruments and Risk - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]  
Average days to maturity of Company's portfolio of cash equivalents and marketable securities 0 days
Maximum [Member]  
Schedule Of Equity Method Investments [Line Items]  
Maturity period of securities 1 year