Annual report pursuant to Section 13 and 15(d)

Leases, Other Commitments, and Contingencies - Summary of Rent Expense from Operating Leases (Detail)

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Leases, Other Commitments, and Contingencies - Summary of Rent Expense from Operating Leases (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Leases Rent Expense [Abstract]      
Rent expense from operating leases $ 117 $ 200 $ 270