MidCap Secured Loan Facility - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Jul. 05, 2013	Dec. 31, 2013
Debt [Line Items]
Secured loan facility	$ 20,000,000
Net proceeds in aggregate amount	19,800,000
Unregistered shares of common stock		357,356
Warrant exercise price		4.20
Days of volume-weighted average share price		20-day volume-weighted average share price of the Common Stock prior to the closing of the Loan
Warrant exercisable term		5 years
Amortization Period of Discount		3 years
Term of loan		36 months
Interest rate		8.45%
LIBOR floor Rate		0.50%
Interest rate at period end		8.95%
Final payment fee Rate		3.50%
Closing fee		0.50%
Exit fee percentage recorded as deferred loan costs		3.50%
Loan amount prepaid in the first year of the Loan		5.00%
Loan amount prepaid in each year thereafter		3.00%
Prepayment of principal amount of the Loan rate		50.00%
Cash prepayment fee of principal amount of Loan		2.00%
Percentage of prepayment amount to purchase shares of Common Stock		2.00%
Mid Cap [Member]
Debt [Line Items]
Secured loan facility	20,000,000
Net proceeds in aggregate amount	19,800,000
Unregistered shares of common stock		357,356
Warrant exercise price		4.20
Notice Period		10 days
Rate of interest Applicable to obligations		4.00%
Secured loan facility due to Midcap		20,000,000
Unamortized discount net		$ 821,961