Commitments and Contingencies - (Tables)

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies [Abstract]

Schedule of changes product warranty liability [Table Text Block]

Changes in the Company’s warranty reserves are as follows:

	Three Months Ended March 31,
	2016		2015
Balance, beginning of the period	$	1,894	$	1,574
Accruals	544		822
Less: Usage	665		696
Balance, end of the period	$	1,773	$	1,700