Accrued Expenses

3 Months Ended

Mar. 31, 2020

Accrued Liabilities, Current [Abstract]

Accrued Expenses

Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	March 31, 2020		December 31, 2019
Accrued compensation costs	$	1,573	$	2,635
Accrued retention payments	2,517		795
Accrued restructuring costs	128		981
Accrued professional services	594		904
Accrued external research and manufacturing costs	1,095		1,717
Other accrued expenses	530		432
	$	6,437	$	7,464