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EQUITY
 6 Months Ended
Jun. 30, 2014
Equity [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
EQUITY
 

(a)
Acorn Stock Options

A summary of stock option activity for the six months ended June 30, 2014 is as follows:

 
 
Number 
of Options
(in shares)
 
Weighted
Average
Exercise
Price Per Share
 
Weighted Average Remaining Contractual Life
 
Aggregate Intrinsic Value
Outstanding at December 31, 2013
 
1,401,658

 
$
5.49

 
 
 
 
Granted
 
180,988

 
$
3.77

 
 
 
 
Exercised
 
(33,938
)
 
$
2.51

 
 
 
 
Forfeited or expired
 
(76,062
)
 
$
2.51

 
 
 
 
Outstanding at June 30, 2014
 
1,472,646

 
$
5.50

 
4.4 years
 
$
5

Exercisable at June 30, 2014
 
1,047,213

 
$
5.44

 
3.6 years
 
$
5



During 2014, 33,938 options were exercised and 76,062 options were forfeited in connection with the “net exercise” of 110,000 options. In a net exercise of an option, the Company does not require a payment of the exercise price of the option from the optionee, but reduces the number of shares of common stock issued upon the exercise of the option by the smallest number of whole shares that has an aggregate fair market value equal to or in excess of the aggregate exercise price for the option shares covered by the option exercised. The 110,000 options which were exercised under this method had a weighted average exercise price exercise price of $2.51.

The fair value of the options granted ($2.49 during the six months ended June 30, 2014) was estimated on the grant dates using the Black-Scholes option-pricing model with the following weighted average assumptions:
        
Risk-free interest rate
 
2.6
%
Expected term of options
 
8.0 years

Expected annual volatility
 
62
%
Expected dividend yield
 
—
%

 


(b)
Stock-based Compensation Expense

Stock-based compensation expense included in the Company’s Condensed Statements of Operations for three and six month periods ended June 30, 2013 and 2014 was as follows:

 
 
Six months ended June 30,
 
Three months ended June 30,
 
 
2013
 
2014
 
2013
 
2014
Research and development expenses, net of credits
 
21

 
26

 
11

 
16

Selling, general and administrative expenses
 
578

 
594

 
307

 
262

   Total stock-based compensation expense
 
599

 
620

 
318

 
278



 
(c)
Warrants

The Company previously issued warrants at exercise prices equal to or greater than market value of the Company’s common stock at the date of issuance.  A summary of warrant activity follows:
 
 
Number 
of Warrants
(in shares)
 
Weighted
Average
Exercise
Price Per Share
 
Weighted Average Remaining Contractual Life
Outstanding at December 31, 2013
 
285,281

 
$
3.18

 
 
Granted
 
—

 
 
 
 
Exercised
 
—

 
—

 
 
Forfeited or expired
 
—

 
—

 
 
Outstanding at June 30, 2014
 
285,281

 
$
3.18

 
4.1 years