Contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability

Changes in the warranty liability for the six months June 30, 2013, and 2012, are summarized below:

	Six Months Ended   June 30,
	2013			2012
Aggregate product warranty liability at beginning of period	$	776		$	313
Net aggregate expense related to product warranties	98			415
Aggregate reductions for payments	(72		)	(213		)
Aggregate product warranty liability at end of period	$	802		$	515