Accrued Liabilities and Accounts Payable - Summary of accrued expenses reflected on the company's balance sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities, Current [Abstract]
Accrued bonus liabilities	$ 901	$ 1,388
Accrued sub-advisor fees	617	793
Other accrued expenses	562	561
Total accrued liabilities and accounts payable	$ 2,080	$ 2,742