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State Research and Development Credit Exchange Receivable - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Accounts and Other Receivables [Line Items]
Percentage of credit exchange receivable	65.00%
Prepaid and other current assets under credit exchange program	$ 298,000	$ 450,000
Estimated amounts receivable under program	$ 223,000	$ 313,000

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- Definition

Estimated amounts credit exchange receivable.

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- Definition

Percentage of credit exchange receivable.

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- Definition

Prepaid and other current assets under credit exchange program.

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No definition available.

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