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WARRANTIES
 12 Months Ended
Dec. 31, 2013
Product Warranties Disclosures [Abstract]  
WARRANTIES
WARRANTIES
The Company provides for anticipated warranty costs at the time the associated revenue is recognized. Product warranty costs are estimated based upon the Company's historical experience and the warranty period. The Company periodically reviews the adequacy of its warranty reserve and adjusts, if necessary, the warranty percentage and accrual based on actual experience and estimated costs to be incurred. Information regarding changes in the Company's product warranty liability for the years ended December 31, 2013 and 2012 is as follows (in thousands):
 
Amount
Balance as of December 31, 2011
$
1,500

Additions charged to cost of product sales
611

Repairs and replacements
(1,309
)
Balance as of December 31, 2012
$
802

Additions charged to cost of product sales
1,172

Repairs and replacements
(277
)
Balance as of December 31, 2013
$
1,697