Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2023

Accrued Expenses and Other Current Liabilities [Abstract]

Accrued expenses and other current liabilities

6. Accrued expenses and other current liabilities

Other accrued expenses and other current liabilities consisted of the following (in thousands):

	As of December 31,
	2023		2022
Payroll and related costs	$	762	$	8,748
Accrued contract termination costs		—		4,700
Research and development expenses		—		978
Professional fees		489		415
Operating lease liabilities		1,473		1,390
Prepaid royalty		—		1,011
Other accrued expenses and current liabilities		409		1,604
Accrued expenses and other current liabilities	$	3,133	$	18,846

We expense advertising costs when incurred, which amounted to $13.2 million for 2022, which was reclassified to discontinued operations as a result of our business shift following the Mayne Transaction. We incurred no advertising costs in 2023.