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Marketable Securities and Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Financial assets and liabilities measured at fair value on a recurring basis
The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2015:
 
 
Fair Value Measurements at
 
June 30, 2015
 
Total
 
Using Quoted Prices
in Active Markets
for Identical Assets
(Level 1)
 
Using Significant
Other Unobservable
Inputs
(Level 2)
 
Using Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Money market funds
$
66,460,760

 
$
66,460,760

 
$

 
$

Mutual funds
58,235,791

 

 
58,235,791

 

US corporate debt securities
25,955,991

 

 
25,955,991

 

Municipal bonds
104,039

 

 
104,039

 

Investment in affiliated entity
18,849,647

 
18,849,647

 

 

Common stock warrants
186,500

 

 

 
186,500

Total Assets
$
169,792,728

 
$
85,310,407

 
$
84,295,821

 
$
186,500

Liabilities:
 
 
 
 
 
 
 
Common stock warrants
$
1,710,229

 
$

 
$

 
1,710,229

Total Liabilities
$
1,710,229

 
$

 
$

 
$
1,710,229


The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2014:
 
 
Fair Value Measurements at
 
December 31, 2014
 
Total
 
Using Quoted Prices
in Active Markets
for Identical Assets
(Level 1)
 
Using Significant
Other Unobservable
Inputs
(Level 2)
 
Using Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Money market funds
$
36,474,066

 
$
36,474,066

 
$

 
$

Mutual funds
29,273,635

 

 
29,273,635

 

US corporate debt securities
23,802,339

 

 
23,802,339

 

Investment in affiliated entity
12,340,811

 
12,340,811

 

 

Common stock warrants
550,000

 

 

 
550,000

Total Assets
$
102,440,851

 
$
48,814,877

 
$
53,075,974

 
$
550,000

Liabilities:
 
 
 
 
 
 
 
Common stock warrants
$
2,022,729

 
$

 
$

 
$
2,022,729

Total Liabilities
$
2,022,729

 
$

 
$

 
$
2,022,729

Assumptions used to estimate the fair values of the common stock warrants
The assumptions used to estimate the fair value of common stock warrants at June 30, 2015 are presented below:
 
Risk-free interest rate
1.01%
Expected volatility
81%
Expected life in years
3.25
Dividend yield
Change in fair value of the financial assets
The following table presents a summary of changes in fair value of the Company’s total Level 3 financial assets for the six months ended June 30, 2015:
Balance at January 1, 2015
$
550,000

Decrease in fair value included in change in fair value of common stock warrants
(363,500
)
Balance at June 30, 2015
$
186,500


Changes in fair value of the financial liabilities
The following table presents the changes in fair value of the Company’s total Level 3 financial liabilities for the six months ended June 30, 2015:
 
Balance at January 1, 2015
$
2,022,729

Decrease in fair value included in change in fair value of common stock warrants
(312,500
)
Balance at June 30, 2015
$
1,710,229

OncoSec [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assumptions used to estimate the fair values of the common stock warrants
The assumptions used to estimate the fair values of the OncoSec common stock warrants at June 30, 2015 are presented below:

Risk-free interest rate
0.28-0.64%
Expected volatility
90%
Expected life in years
1.25-1.75
Dividend yield