MidCap Secured Loan Facility - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jul. 05, 2013 Mid Cap [Member]	Jun. 30, 2014 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
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%	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%
Notice Period				10 days
Rate of interest Applicable to obligations				4.00%
Secured loan facility due to Midcap				15,342,433
Unamortized discount net				$ (657,567)