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Capital Stock (Tables)
 3 Months Ended
Mar. 31, 2017
Authorized, Issued and Reserved shares of common stock
As of March 31, 2017 the Company has 229,435,726 shares of common stock outstanding and the following shares of common stock are reserved for issuance:
 
 
 
Reserved
 
 
Strike
 
 
 
 
 
for issuance
 
 
Price
 
 
Expiry
 
 
 
 
 
 
 
 
 
Shares reserved under outstanding stock options and options available for grant
 
 
52,092,463
 
 
 
 
 
 
 
Rights associated with Employee Stock Purchase Plan
 
 
15,455
 
 
 
 
 
 
 
Warrants to purchase common stock associated with the 2016 Debt Restructuring
 
 
5,169,577
 
 
$
0.0994
 
 
Aug 1, 2026
Warrants to purchase common stock associated with July 2016 private placement
 
 
56,262,571
 
 
$
0.0994
 
 
Jul 29, 2023
Warrants to purchase common stock associated with December 2014 private placement
 
 
50,189,431
 
 
$
0.1003
 
 
Dec 23, 2021
Warrants to purchase common stock associated with December 2014 venture loan and security agreement
 
 
2,492,523
 
 
$
0.1003
 
 
Dec 23, 2024
Warrants to purchase common stock associated with September 2014 consulting agreement with Danforth Advisors
 
 
100,000
 
 
$
0.2500
 
 
Sep 8, 2024
Outstanding warrants issued in May 2013, vesting August 2013
 
 
14,426,230
 
 
$
0.2745
 
 
Aug 9, 2020
Outstanding warrants issued in May 2013, vesting May 2013
 
 
20,655,737
 
 
$
0.2745
 
 
May 17, 2020
Outstanding warrants issued in June 2012
 
 
437,158
 
 
$
0.2745
 
 
Jun 29, 2017
Total common shares reserved for issuance at March 31, 2017
 
 
201,841,145
 
 
 
 
 
 
 
Total common shares issued and outstanding at March 31, 2017
 
 
229,435,726
 
 
 
 
 
 
 
Total common shares outstanding and reserved for issuance at March 31, 2017
 
 
431,276,871
 
 
 
 
 
 
 
Venture Loan [Member]  
Black-Scholes Pricing Model Assumptions to Determine Fair Value of Warrants
 
The fair value of the 2016 Warrants at issuance was $6.5 million. Fair value of the 2016 Warrants was calculated using the following inputs in a Black-Scholes model:  
 
 
 
July 29, 2016
 
Risk-free interest rate
 
 
1.52
%
Expected life
 
 
7 years
 
Expected volatility
 
 
147.03
%
Dividend yield
 
 
0
%
Placement Agent Warrants 2014 [Member]  
Authorized, Issued and Reserved shares of common stock
Fair value of the 2016 Lender Warrants was calculated using the following inputs in a Black-Scholes model:
  
 
 
August 1, 2016
 
Risk-free interest rate
 
 
1.78
%
Expected life
 
 
10 years
 
Expected volatility
 
 
138.81
%
Dividend yield
 
 
0
%