Accrued Expenses and Other Current Liabilities and Other Liabilities - Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accrued Expenses and Other Current Liabilities and Other Liabilities
Patient prepayments, deposits, and refunds payable	$ 25,738	$ 27,195
Accrued sales taxes and other taxes	9,661	9,863
Insurance and self-insurance accruals	8,213	7,651
Derivative liability	7,528	7,686
Accrued professional fees	1,486	1,016
Accrued interest payable	522	440
Other current liabilities	10,185	9,010
Total	$ 63,333	$ 62,861