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Summary of Significant Accounting Policies - Summary of the Calculation of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Net loss/net increase in net assets resulting from operations available to common stockholders $ (34,783) $ (1,762) $ (25,046)
Weighted average common shares outstanding applicable to basic EPS 24,445,452 24,342,979 24,214,978 [1]
Adjusted weighted average common shares outstanding applicable to diluted EPS 24,445,452 24,342,979 24,214,978 [1]
Basic net loss per share $ (1.42) $ (0.07) $ (1.03) [1]
Diluted net loss per share $ (1.42) $ (0.07) $ (1.03) [1]
[1] Balance includes the nine months ended December 31, 2018 under Bank Holding Company Accounting and the three months ended March 31, 2018 under Investment Company Accounting.