Accounts payable and other liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Other Liabilities

(in thousands)	DECEMBER 31, 2017		DECEMBER 31, 2016
Trade accounts payable	$	6,016	$	6,860
Accrued clinical/preclinical expenses		2,667		1,381
Accrued compensation and vacation		1,553		1,024
Other liabilities		720		254
	$	10,956	$	9,519