Subsequent Events - Additional Information (Detail) - USD ($)		Jul. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Debentures borrowed	[1]		$ 154,874,000	$ 174,614,000
Small Business Administration Debentures and Borrowings [Member]
Subsequent Event [Line Items]
Debenture outstanding amount			74,436,000
Debenture remaining borrowing capacity			$ 20,436,000
Subsequent Event [Member] | Small Business Administration Debentures and Borrowings [Member]
Subsequent Event [Line Items]
Note Amounts		$ 25,000,000
Debentures term		10 years
Leverage fee amount		$ 250,000
Remaining portion of leverage fee amount		500,000
Debenture outstanding amount		8,500,000
Debenture remaining borrowing capacity		16,500,000
Remaining amount of debenture after deducting leverage fee kept for capitalization of retained earning or capital infusion		8,250,000
Subsequent Event [Member] | Small Business Administration Debentures and Borrowings [Member] | Debenture Mature 2021 [Member]
Subsequent Event [Line Items]
Debentures borrowed		$ 8,500,000
Subsequent Event [Member] | Small Business Administration Debentures and Borrowings [Member] | Maximum [Member]
Subsequent Event [Line Items]
Debenture last issuance date		Sep. 24, 2024

[1] Includes $2,136 and $2,511 of deferred financing costs as of June 30, 2020 and December 31, 2019.