Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2022

Accrued Liabilities, Current [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued expenses consisted of the following (in thousands):

	March 31,		December 31,
	2022		2021
Accrued compensation and other employee benefits	$	2,180	$	3,516
Accrued professional services		281		200
Accrued research and development expenses		39		41
Accrued other expenses		411		521
Total accrued expenses	$	2,911	$	4,278