Commitments and Contingencies - (Tables)

6 Months Ended

Jun. 30, 2013

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,
	2013			2012
Balance, beginning of the period	$	2,024		$	1,406
Accruals	1,033			1,033
Warranty liability assumed in acquisition	—			93
Usage	(1,365		)	(1,023		)
Balance, end of the period	$	1,692		$	1,509