Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Warrant Fair Value Assumptions

The fair value of the warrant was calculated using the Black-Scholes option pricing model with the following assumptions:

Risk-free interest rate	0.48	%
Expected dividend yield	0	%
Expected life (years)	2.5
Expected volatility	82.29	%

Summary of Principal Payments

The following schedule shows the payments for principal and the end of term charge on the Hercules loan by calendar year:

2014	$	351,527
2015		2,246,215
2016		2,495,163
2017		1,457,095
Total	$	6,550,000