Income Taxes - Income tax reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2019
Income Taxes
Statutory tax rate	21.00%		35.00%
Reconciliation of effective income tax amount
Tax at statutory rate	$ (24,268,000)	$ (86,390,000)
State income taxes	(11,056,000)	(8,520,000)
Foreign income taxes	1,459,000	1,290,000
Nondeductible goodwill impairment	3,465,000	34,967,000
Cancellation of debt income		6,429,000
Permanent differences	145,000	1,061,000
Changes in valuation allowance	90,334,000	75,210,000
Unremitted earnings	1,218,000	891,000
GILTI Inclusion	567,000	639,000
Expiration and reduction of tax attributes	(53,265,000)	(30,103,000)
Uncertain tax positions	4,051,000
Debt related basis differences		10,994,000
Other	(3,782,000)	(2,269,000)
Income tax expense	8,868,000	4,199,000
Inclusion for the period	2,700,000
GILTI Inclusion	567,000	639,000
Income tax expense (benefit) BEAT	$ 0	$ 0