Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Additional Information (Detail)

v3.20.1
Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Financial Instruments Disclosure [Abstract]    
Accrued interest receivable $ 800,000 $ 900,000
Write off, of accrued interest receivable 0 0
Restricted Cash $ 1,400,000 $ 1,400,000