Stock Purchase Warrants - Schedule of Equity Classified Warrants Outstanding (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Class of Warrant or Right [Line Items]
EXERCISE PRICE PER SHARE	$ 0.05
March 2016 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES	2,006	2,006
EXERCISE PRICE PER SHARE	$ 5.00	$ 5.00
February 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES	75,000	75,000
EXERCISE PRICE PER SHARE	$ 5.00	$ 5.00
November 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES	75,000	75,000
EXERCISE PRICE PER SHARE	$ 5.00	$ 5.00
August 2020 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES	157,500	157,500
EXERCISE PRICE PER SHARE	$ 5.00	$ 5.00
December 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES	408,295	408,295
EXERCISE PRICE PER SHARE	$ 0.05	$ 0.05