REVENUE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 310,605,000	$ 197,057,000	$ 851,416,000	$ 562,193,000
Contract asset	5,900,000		5,900,000		$ 4,800,000
Contract liability	700,000		700,000		$ 400,000
Revenue recognized from prior period			400,000
Estimated variable consideration, increase in revenue	(900,000)	100,000
Mortgage products
Disaggregation of Revenue [Line Items]
Revenue	62,004,000	55,287,000	162,606,000	195,697,000
Credit Cards
Disaggregation of Revenue [Line Items]
Revenue	54,822,000	42,698,000	165,373,000	127,577,000
Personal Loans
Disaggregation of Revenue [Line Items]
Revenue	43,873,000	38,569,000	117,513,000	100,744,000
Insurance
Disaggregation of Revenue [Line Items]
Revenue	74,849,000	14,000	213,882,000	40,000
Other Products And Services
Disaggregation of Revenue [Line Items]
Revenue	75,057,000	60,489,000	192,042,000	138,135,000
Non-mortgage products
Disaggregation of Revenue [Line Items]
Revenue	$ 248,601,000	$ 141,770,000	$ 688,810,000	$ 366,496,000