RELATED PARTY TRANSACTIONS WITH IAC - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Refunds received				$ 3,071,000
Distribution to IAC pursuant to the tax sharing agreement					$ 11,355,000
IAC | Services Agreement
Related Party Transaction [Line Items]
Charges for services rendered pursuant to the services agreement	$ 1,200,000	$ 1,300,000		2,400,000	2,700,000
Outstanding receivable due	0			0		$ 0
Outstanding payables due	0			0		0
IAC | Sublease Agreement
Related Party Transaction [Line Items]
Revenue from related parties	400,000	$ 500,000		900,000	$ 500,000
IAC | Tax Sharing Agreement
Related Party Transaction [Line Items]
Outstanding payables due	700,000			700,000		$ 200,000
Refunds received	$ 3,100,000			$ 3,100,000
Distribution to IAC pursuant to the tax sharing agreement			$ 11,400,000
IAC | Employee Matters Agreement
Related Party Transaction [Line Items]
Shares received from related party pursuant to employee matters agreement (shares)	0	100,000		200,000	300,000