REVENUE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 278,421,000	$ 184,101,000	$ 540,811,000	$ 365,136,000
Contract asset	5,300,000		5,300,000		$ 4,800,000
Contract liability	800,000		800,000		$ 400,000
Revenue recognized from prior period	100,000		400,000
Estimated variable consideration, increase in revenue	500,000	200,000
Mortgage products
Disaggregation of Revenue [Line Items]
Revenue	54,618,000	66,948,000	100,602,000	140,410,000
Credit Cards
Disaggregation of Revenue [Line Items]
Revenue	56,045,000	38,747,000	110,551,000	84,879,000
Personal Loans
Disaggregation of Revenue [Line Items]
Revenue	41,109,000	36,210,000	73,640,000	62,175,000
Insurance
Disaggregation of Revenue [Line Items]
Revenue	71,941,000	13,000	139,033,000	26,000
Other Products And Services
Disaggregation of Revenue [Line Items]
Revenue	54,708,000	42,183,000	116,985,000	77,646,000
Non-mortgage products
Disaggregation of Revenue [Line Items]
Revenue	$ 223,803,000	$ 117,153,000	$ 440,209,000	$ 224,726,000