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Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Schedule of Dividends Paid Since Approval Of The Quarterly Dividend

Dividends paid in 2013 were as follows:

 

 

Period   Regular dividend per share     Special dividend per share     Total dividend paid per share     Dividend paid in cash     Value of dividend paid in shares under the DRIP     Total dividend paid     Value of share discount under the DRIP     Number of shares granted under the DRIP  
First quarter 2013   $ 0.035     $ —     $ 0.035     $ 517     $ 117     $ 634     $ 6       18,976  
Year ended December 31, 2013   $ 0.035     $ —     $ 0.035     $ 517     $ 117     $ 634     $ 6       18,976  
Schedule of Option Grants to Directors and Officers

Option grants to directors and officers for the years ended December 31, 2013 and 2014 can be found below:

 

    2013     2014  
    Number of shares     Weighted average exercise price     Number of shares     Weighted average exercise price  
Options granted to - directors and officers during the year     *201,095       5.98       634,103     $ 2.12  
Exercised by directors and officers during the year     30,316       3.30       33,938       2.51  
Forfeited by directors and officers during the year     125,518       4.11       191,062       3.90  
Number of options held by directors and officers at year end     1,179,658       5.30       1,535,428       4.24  

 

* Includes 25,000 options granted to a director of USSI.
Schedule of Fair Value Assumptions Estimated Using Black-Scholes Pricing Model

The Company utilized the Black-Scholes option-pricing model to estimate fair value, utilizing the following assumptions for the respective years (all in weighted averages):

 

    2013     2014  
Risk-free interest rate     1.8 %     2.1 %
Expected term of options, in years     6.7       7.0  
Expected annual volatility     59 %     64 %
Expected dividend yield     0.2 %     — %
Determined weighted average grant date fair value per option   $ 3.36     $ 1.36  
Summary of Stock Option Plans

A summary of the Company’s option plans as of December 31, 2013 and 2014, as well as changes during each of the years then ended, is presented below:

 

    2013     2014  
    Number of Options (in shares)       Weighted Average Exercise Price     Number of Options (in shares)     Weighted Average Exercise Price  
Outstanding at beginning of year     1,311,397     $ 5.20       1,401,658     $ 5.49  
Granted at market price     246,095       6.06       664,103       2.14  
Exercised *     (30,316 )     3.30       (33,938 )     2.51  
Forfeited or expired     (125,518 )     4.11       (219,395 )     3.96  
Outstanding at end of year     1,401,658       5.49       1,812,428       4.51  
Exercisable at end of year     1,029,507     $ 5.06       1,128,434     $ 5.56  

 

* All shares issued in connection with option exercises were newly issued shares.
Summary of Option Exercises between Cashless Net Exercises and Cash Exercises

The breakdown of option exercises between cashless net exercises and cash exercises is as follows the years ended December 31, 2013 and 2014:

 

      Shares granted in net exercise of options     Options forfeited in net exercise of options     Total net exercise options     Weighted average exercise price for net exercise options     Options exercised for cash     Weighted average exercise price for options exercised for cash  
Year ended December 31, 2013         30,316       102,184       132,500     $ 3.30       —       —  
Year ended December 31, 2014         33,938       76,062       110,000     $ 2.51       —       —  
Summary Information Regarding to Options Outstanding and Exercisable

Summary information regarding the options outstanding and exercisable at December 31, 2014 is as follows:

 

      Outstanding     Exercisable  
Range of Exercise Prices     Number
Outstanding		     Weighted
Average
Remaining
Contractual
Life		     Weighted
Average
Exercise
Price		     Number
Exercisable		     Weighted
Average
Exercise
Price		  
      (in shares)     (in years)           (in shares)        
$0.97 – $2.56       560,615       6.3     $ 1.64       65,500     $ 2.35    
$3.51 – $5.00       426,264       4.5     $ 4.19       336,388     $ 4.24    
$5.05 – $5.91       332,500       3.3     $ 5.22       332,500     $ 5.22    
$6.31 – $7.57       329,690       5.2     $ 6.87       264,021     $ 6.86    
$7.60 – $11.42       163,359       4.8     $ 8.82       130,025     $ 8.78    
        1,812,428                       1,128,434            
Stock-Based Compensation Expense Included In Statements of Operations

Stock-based compensation expense included in the Company’s Statements of Operations was:

 

    Year ended
December 31,		  
    2013     2014  
Research and development expense   $ —     $ 35  
Selling, general and administrative expense     927       830  
 Total   $ 927     $ 865  
Summary Status of DSIT Plan

A summary status of the DSIT Plan as of December 31, 2013 and 2014, as well as changes during the years then ended, is presented below:

 

    2013     2014  
    Number
of
Options
(in
shares)		     Weighted
Average
Exercise
Price		     Number
of
Options
(in
shares)		     Weighted
Average
Exercise
Price		  
Outstanding at beginning of year     238,764     $ 1.69       243,924     $ 1.78  
Granted at fair value     6,700 *   $ 2.70       —     $ —  
Exercised     —     $ —       —     $ —  
Forfeited     (1,540 )*   $ 2.70       (4,500 )   $ 2.41  
Outstanding at end of year     243,924     $ 1.78       239,424     $ 1.67  
Exercisable at end of year     101,904     $ 1.51       101,904     $ 1.45  

 

* The weighted average exercise price of these grants and forfeitures are NIS 9.38 translated to US dollars using the year end exchange rates (NIS 3.47 and NIS 3.89 for the years ended December 31, 2013 and 2014, respectively)
Summary Information Regarding Options Plan Outstanding and Exercisable

Summary information regarding the options under the Plan outstanding and exercisable at December 31, 2014 is as follows:

 

      Outstanding     Exercisable  
Range of Exercise
Prices		     Number
Outstanding		     Weighted
Average
Remaining
Contractual
Life		     Weighted
Average
Exercise
Price		     Number
Exercisable		     Weighted
Average
Exercise
Price		  
      (in shares)     (in years)           (in shares)        
$1.05 – $1.26       147,770       3.6     $ 1.18       81,068     $ 1.20  
$2.41       91,654       3.6     $ 2.41       20,836     $ 2.41  
        239,424             $ 1.67       101,904     $ 1.45  
Summary Status of USSI 2012 Stock Option Plan

A summary status of the USSI 2012 Stock Option Plan as of December 31, 2013 and 2014, as well as changes during the years then ended, is presented below:

 

    2013     2014  
     Number of Options       Weighted Average Exercise Price     Weighted Average Remaining Contractual Life     Number of Options     Weighted Average Exercise Price     Weighted Average Remaining Contractual Life  
    (in shares)           (in years)     (in shares)           (in years)  
Outstanding at beginning of year     632,375     $ 1.72               636,375       1.72          
Granted at fair value     50,000       1.72               —       —          
Exercised     —       —               —       —          
Forfeited     (46,000 )     1.72               (277,687 )     1.72          
Outstanding at end of year     636,375       1.72       5.7       358,688       1.72       4.7  
Exercisable at end of year     460,619     $ 1.72       5.7       312,126       1.72       4.7  
Summary of Warrant Activity

The Company has 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:

 

    2013     2014  
    Number of shares underlying warrants      Weighted Average Exercise Price     Number of shares underlying warrants     Weighted Average Exercise Price  
Outstanding at beginning of year       28,750     $ 3.68       285,281     $ 3.18  
Granted       262,281       3.14       2,357,142       1.30  
Exercised       (5,750 )     3.68       —       —  
Forfeited or expired       —       —       —       —  
Outstanding and exercisable at end of year       285,281     $ 3.18       2,642,423     $ 1.50