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8. Stock-Based Compensation (Tables)
6 Months Ended
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Employee stock-based compensation expense
   Three Months   Six Months 
   Ended   Ended 
   September 30,   September 30, 
   2014   2013   2014   2013 
Cost of service revenue  $59,000   $30,000   $123,000   $56,000 
Research and development   82,000    45,000    178,000    78,000 
Selling, general and administrative   315,000    221,000    606,000    349,000 
Total stock-based compensation  $456,000   $296,000   $907,000   $483,000 
Weighted average assumptions of fair falue of employee stock options
   

Three and Six Months

Ended

September 30,

   

Six Months

Ended

September 30,

 
    2014     2013     2014     2013  
Expected life   8.90 years     5.89 years     5.89 years     5.89 years  
Risk-free interest rate     2.32%       1.42%       1.42%       1.42%  
Dividend yield     0.00%       0.00%       0.00%       0.00%  
Volatility     98%       86%       86%       86%  
Fair value of options granted   $ 2.39     $ 2.10     $ 2.10     $ 2.10  
Summary of option activity
   Number of
Shares
   Weighted-
Average
Exercise Price
   Weighted-
Average
Contractual Term
   Aggregate
Intrinsic
Value
 
Outstanding at April 1, 2014   2,536,000   $7.78           
Options granted   245,000    2.76           
Options exercised                  
Options forfeited or expired   (27,000)   20.88           
Outstanding at September 30, 2014   2,754,000   $7.21    8.24   $ 
Exercisable at September 30, 2014   1,197,000   $11.62    6.71   $ 
Options available for grant as of September 30, 2014   1,579,000