Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2022

Accrued Liabilities, Current [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued expenses consisted of the following (in thousands):

	June 30,		December 31,
	2022		2021
Accrued compensation and other employee benefits	$	2,894	$	3,516
Accrued professional services		284		200
Accrued research and development expenses		93		41
Accrued other expenses		785		521
Total accrued expenses	$	4,056	$	4,278