Accrued Expenses and Other Long-Term Liabilities

12 Months Ended

Dec. 31, 2018

Accrued Expenses and Other Long-Term Liabilities

9. Accrued Expenses and Other Long-Term Liabilities

Accrued expenses consist of the following:

	As of December 31,
	2018		2017
Accrued compensation	$	4,397	$	4,014
Accrued research and development expenses		3,414		2,384
Accrued professional expenses		1,049		735
Other accrued expenses		347		411
Other restructuring expenses		173		—
Total	$	9,380	$	7,544

Accrued research and development expenses are comprised of amounts owed to third-party contract research organizations, clinical investigators, laboratories and data managers for research and development work performed on behalf of the Company.