Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies - Additional Information (Detail)

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Commitments And Contingencies - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended
Sep. 24, 2009
Jan. 31, 2006
sqft
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitment And Contingencies [Line Items]          
Lease period   5 years      
Area of corporate headquarters and manufacturing facility   57,000      
Initial monthly installments   $ 38,692      
Extended lease term April 20, 2015        
Rent expense     789,000.0 1,000,000 849,000.0
Change in control, if occurs, may require severance benefits payable     714,000    
Purchase commitments pending     $ 9,700,000