Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	March 31,		December 31,
	2018		2017
Research and development related	$	4,816	$	4,962
Compensation related		1,331		2,345
Consulting and professional services		566		1,012
Other		482		256
	$	7,195	$	8,575