Accrued Liabilities - Rollforward related to restructure (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Accrued Liabilities.
Beginning balance			$ 3,631
Severance and other related expenses	$ 4,300		4,210	$ 7,578
Cash payments			(5,220)	(3,947)
Ending balance			$ 2,622	3,631
Accelerated equity compensation expense	500	$ 2,200		2,200
Restructuring charges	$ 2,600			$ 11,700