Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Stock Price	$ 0.62	$ 0.64
Risk-free Rate	1.73%	1.75%
Volatility (Annual)	93.46%	93.43%
Time to maturity (Years)		5 years 3 months 29 days
Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time to maturity (Years)	4 years 10 months 6 days
Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time to maturity (Years)	5 years 29 days