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State Research and Development Credit Exchange Receivable - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Accounts and Other Receivables [Line Items]
Percentage of credit exchange receivable	65.00%
Estimated amounts receivable under program, Current	$ 803,000	$ 0
Estimated amounts receivable under program, Long-term	$ 260,000	$ 298,000

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- Definition

Estimated Amounts Credit Exchange Receivable Current

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- Definition

Estimated Amounts Credit Exchange Receivable Noncurrent

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- Definition

Percentage of credit exchange receivable.

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