RELATED PARTY TRANSACTIONS (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) installment	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) installment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 30, 2020	Mar. 31, 2020 USD ($) installment
Earnout Notes Payable
Related Party Transaction [Line Items]
Notes payable	$ 2,500,000		$ 2,500,000				$ 7,300,000
Number of installments | installment							3
Number of installments paid | installment	2		2
Accrued interest	$ 100,000		$ 100,000
Cross Country Talent Acquisition Group, LLC
Related Party Transaction [Line Items]
Joint venture, percent ownership						68.00%
Revenue from related parties	0	$ 3,600,000	0	$ 11,300,000
Receivable balance with joint venture	0		0		$ 1,700,000
Payable balance with joint venture	0		0		200,000
Chief Executive Officer
Related Party Transaction [Line Items]
Payable balance with joint venture	0		0		0
Related party fees	0	$ 0	200,000	0
Health Care System Affiliated with a Board Member
Related Party Transaction [Line Items]
Revenue from related parties	200,000		300,000	$ 0
Accounts receivable from related parties	$ 200,000		$ 200,000		$ 0