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Collaborative Research and Development Agreements, Government Programs and Licenses (Tables)
 9 Months Ended
Sep. 30, 2015
Research and Development [Abstract]  
Schedule of Share-based Payment Award Valuation Assumptions
The estimated fair value of the ADM Warrant shares that had vested was determined using the Black-Scholes option pricing model based upon the following assumptions during the nine months ended September 30, 2015 and 2014:
 
September 30, 2015
 
September 30, 2014
Average volatility
78
%
 
54
%
Average risk-free interest rate
1.31
%
 
1.63
%
Exercise price
$7.17

 
$7.17

Average stock price
$2.77

 
$10.98

Average expected remaining life (in years)
3.7

 
4.7