Accrued Expenses and Other Current Liabilities and Other Liabilities - Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Patient prepayments, deposits, and refunds payable	$ 28,992	$ 26,475
Insurance and self-insurance accruals	9,296	8,943
Accrued sales taxes and other taxes	7,900	7,803
Derivative liability	2,698	6,425
Accrued professional fees	710	750
Accrued interest payable	723	707
Other current liabilities	8,072	9,296
Total	$ 58,391	$ 60,399