Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities and Other Liabilities [Abstract]
Accrued marketing	$ 155	$ 1,121
Accrued cost of sales, including credit bureau costs	5,044	5,451
Accrued general and administrative expense and professional fees	570	2,137
Insurance premiums	340	360
Estimated liability for non-income business taxes	783	94	$ 3,427
Other	1,641	1,815
Total	$ 8,533	$ 10,978