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State Research and Development Credit Exchange Receivable - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts and Other Receivables [Line Items]      
Estimated amounts receivable under program $ 282,000 $ 289,000 $ 609,000
Percentage of credit exchange receivable 65.00%