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Restructuring - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
Restructuring - Additional Information (Detail) (USD $)	Apr. 30, 2013 Positions	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Reduction of workforce position	15
Percentage of reduction in workforce	50.00%
Expense related to stock options		$ 38,000
Restructuring Expense		279,000us-gaap_RestructuringCharges
General and Administrative Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Expense		17,000
Research and Development Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Expense		$ 262,000

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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