Commitments and Contingencies - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | ||||
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Jul. 31, 2010
Patents
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Dec. 31, 2009
Respondent
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Sep. 30, 2009
Respondent
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Commitment And Contingencies [Line Items] | ||||||
Purchase order outstanding | $ 7,156,000 | |||||
Total annual rental expense | 5,806,000 | 5,557,000 | 5,190,000 | |||
Total annual rental income | $ 854,000 | $ 791,000 | $ 607,000 | |||
Number of respondents with whom a settlement was reached | 5 | 2 | ||||
Number of the Company's patents found invalid | 2 |