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Commitments and Contingencies - Warranty (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Schedule of Changes in Reserve for Product Warranty Claim Costs    
Balance at Beginning of Period $ 404 $ 6
Accruals (Reductions) for Warranties Issued During the Period 375 0
Settlements (in Cash or in Kind) During the Period (779) 0
Balance at End of Period $ 0 $ 6