Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 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):

	Nine Months Ended
	September 30,
	2017			2016
Warranty liability balance, beginning of the period	$	1,821		$	2,553
Product warranty accruals	346			985
Utilization of accrual	(850		)	(1,489		)
Warranty liability balance, end of the period	$	1,317		$	2,049