Accrued Expenses

3 Months Ended

Mar. 31, 2020

Payables and Accruals [Abstract]

Accrued Expenses

Accrued Expenses

Accrued expenses consist of the following (in thousands):

	March 31,		December 31,
	2020		2019
Payroll and employee related expenses	$	1,401	$	2,235
Collaboration and licensing	—		1,050
Accrued patent fees	1,324		487
Accrued external research and development costs	5,414		4,379
Accrued professional and consulting services	353		446
Accrued interest	60		82
Issuance costs, December 2019 financing	—		4,381
Other	223		432
Accrued expenses	$	8,775	$	13,492