Related Party Transactions - Additional Information (Detail) - USD ($) shares in Thousands		3 Months Ended		6 Months Ended
	Apr. 20, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Payments for repurchase of common stock				$ 1,510,000	$ 0
Proceeds from issuance of warrants	$ 1,500,000			1,500,000	0
Interest expense, related party		$ 379,000		$ 379,000
Number of company shares owned by related party (in shares)		419		419
New Credit Agreement
Related Party Transaction [Line Items]
Debt instrument, face amount	$ 20,000,000.0
Long-term debt outstanding		$ 20,000,000		$ 20,000,000
Digital Matrix Systems
Related Party Transaction [Line Items]
Payment of monthly installments for monitoring credit and on-line credit analysis services		216,000	$ 340,000	432,000	556,000
Amount owed to related parties		70,000		70,000		$ 70,000
Fees payable for credit information processing services and implementation and disaster recovery services		92,000		$ 92,000		$ 92,000
Loeb Partners Corporation
Related Party Transaction [Line Items]
Advisory fees paid					553,000
Development, Implementation, and Monthly Service Fees | Digital Matrix Systems
Related Party Transaction [Line Items]
Amounts of transaction		$ 541,000			$ 970,000