Quarterly report pursuant to Section 13 or 15(d)

6. Stock-Based Compensation (Tables)

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6. Stock-Based Compensation (Tables)
 9 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Employee stock-based compensation expense
    Three Months     Nine Months  
    Ended     Ended  
    December 31,     December 31,  
    2013     2012     2013     2012  
Cost of service revenue   $ 29,000     $ 37,000     $ 84,000     $ 103,000  
Research and development     45,000       57,000       122,000       187,000  
Selling, general and administrative     217,000       176,000       566,000       660,000  
Total stock-based compensation   $ 291,000     $ 270,000     $ 772,000     $ 950,000  
Weighted-average assumptions of fair value of employee stock options
   

Three Months

Ended

December 31,

    

Nine Months

Ended

December 31,

  
    2013     2012     2013     2012  
Expected life   5.10 years     5.00 years     5.83 years     5.79 years  
Risk-free interest rate     1.75%       0.62%       1.44%       0.72%  
Dividend yield     0.00%       0.00%       0.00%       0.00%  
Volatility     82%       89%       85%       88%  
Fair value of options granted   $ 2.16     $ 6.51     $ 2.11     $ 8.05  
Summary of option activity
    Number of
Shares		     Weighted-
Average
Exercise Price		     Weighted-
Average
Contractual 
Term		     Aggregate
Intrinsic
Value		  
Outstanding at March 31, 2013     975,000     $ 15.08                  
Options granted     362,000       2.97                  
Options exercised     –       –                  
Options forfeited or expired     (84,000 )     15.86                  
Outstanding at December 31, 2013     1,253,000     $ 11.54       7.24     $ 220,000  
Exercisable at December 31, 2013     883,000     $ 14.58       6.35     $ 76,000  
Options available for grant as of December 31, 2013     824,000