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Balance Sheet Details (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accrued warranty obligations    
Warranty liability at beginning of period $ 2,329 $ 1,525
Additions charged to operations 2,256 1,267
Deductions from liability (1,921) (1,054)
Warranty liability at end of period $ 2,664 $ 1,738