Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accrued Expenses and Other Current Liabilities
Professional fees	$ 3,428	$ 4,717
Consulting fees/provider fees	10,643	23,167
Client performance guarantees	5,964	7,215
Legal fees	1,971	2,419
Interest payable	7,295	2,049
Income tax payable	4,420	1,627
Insurance	5,630	3,139
Marketing	4,218	2,815
Operating lease liabilities - current	11,829	11,438
Earnout	4,138	4,514
Other	22,861	20,557
Total	$ 82,397	$ 83,657