Note 7 - Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

	2018		2017
Accrued payroll and related costs	$	2,871	$	2,400
Accrued contract manufacturing costs		2,516		666
Accrued clinical trial costs		2,318		2,570
Accrued consulting and service fee expenses		1,229		1,860
Accrued legal and professional fees		1,191		1,022
Other		408		1,037
Accrued expenses	$	10,533	$	9,555