Commitments and Contingencies - (Tables)

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies [Abstract]

Schedule of changes product warranty liability [Table Text Block]

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

	Six Months Ended June 30,
	2015		2014
Balance, beginning of the period	$	1,574	$	1,551
Accruals	1,300		961
Less: Usage	1,051		1,035
Balance, end of the period	$	1,823	$	1,477