Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

The following is a summary of the change in the Company's warranty accrual reserve (in thousands):

	Three Months Ended
	March 31,
	2017			2016
Warranty liability balance, beginning of the period	$	1,821		$	2,553
Product warranty accruals	223			385
Utilization of accrual	(315		)	(603		)
Warranty liability balance, end of the period	$	1,729		$	2,335