Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Accrued Liabilities [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued liabilities consisted of the following (in thousands):

	As of December 31,
	2018		2017
Payroll and related liabilities	$	3,620	$	3,659
Other	4,750		7,105
Total accrued liabilities	$	8,370	$	10,764