Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Accrued Liabilities [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued liabilities consisted of the following (in thousands):

	As of December 31,
	2017		2016
Payroll and related liabilities	$	3,659	$	4,579
Other	7,105		8,313
Total accrued liabilities	$	10,764	$	12,892