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7. Stock-Based Compensation (Tables)
3 Months Ended
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Weighted-average assumptions of fair value of employee stock options
    Three Months Ended June 30,  
    2016     2015  
Expected Term     7.45 yrs       8.96 yrs  
Risk-free interest rate     1.40%       2.18%  
Dividend yield     0.00%       0.00%  
Volatility     92.4%       86.0%  
Fair value of options granted   $ 3.46     $ 5.50  
Employee stock-based compensation expense
   Three Months Ended June 30, 
   2016   2015 
Cost of revenues  $68,000   $55,000 
Research and development   64,000    73,000 
Selling, general and administrative   279,000    284,000 
Total stock-based compensation  $411,000   $412,000 
Plan summary
Plan  Awards Outstanding
2006 Plan  172,000
2011 Plan  582,000
   754,000
Awards available for grant as of June 30, 2016  578,000
Schedule of option activity
    Number of
Shares
    Weighted-
Average
Exercise Price
    Weighted-
Average
Contractual Term
    Aggregate
Intrinsic
Value
 
Outstanding at April 1, 2016     753,000     $ 21.47                  
Options granted     16,000       4.65                  
Options exercised                            
Options forfeited     (1,000 )     19.14                  
Options expired     (14,000 )     17.81                  
Outstanding at June 30, 2016     754,000     $ 21.18       7.69     $  
Exercisable at June 30, 2016     504,000     $ 26.81       7.15     $  
Restricted Stock Award Activity

Restricted stock award activity is as follows:

 

 

 

Number of

Shares

  

Weighted

Average Award

Date Fair Value

per Share

 
Unvested restricted stock awards outstanding at April 1, 2016      $ 
Restricted stock awards granted   4,000    4.85 
Restricted stock awards vested   (4,000)   4.85 
Restricted stock awards forfeited        
Unvested restricted stock awards outstanding at June 30, 2016      $