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Income taxes - Total provision (benefit) for income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Income Taxes
Loss before income tax expense	$ (3,891)	$ (2,922)	$ (22,060)	$ (12,085)
Statutory tax rate	21.00%	21.00%	21.00%	21.00%
Income tax (benefit) expense at federal statutory rate			$ (4,633)	$ (2,538)
Increase (decrease) resulting from:
Permanent differences			2,300	494
State income tax, net of federal benefit			(177)	(343)
Valuation allowance			3,428	3,583
Other, net			(710)	9
Income tax expense			208	1,205
Current income tax expense			279	5
Deferred income tax benefit			(71)	1,200
Total income tax provision	$ 31	$ (15)	$ 208	$ 1,205

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and adjustments.

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