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7. Stock-Based Compensation (Tables)
6 Months Ended
Sep. 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

September 30,

  

Six Months

Ended

September 30,

 
   2016   2015   2016   2015 
Expected life  9.10 years   5.95 years   7.97 years   6.32 years 
Risk-free interest rate   1.49%    1.62%    1.45%    1.66% 
Dividend yield   0.00%    0.00%    0.00%    0.00% 
Volatility   98%    89%    94%    89% 
Fair value of options granted  $3.64   $4.25   $3.68   $4.40 
Employee stock-based compensation expense
   Three Months   Six Months 
   Ended   Ended 
   September 30,   September 30, 
   2016   2015   2016   2015 
Cost of service revenue  $66,000   $62,000   $134,000   $117,000 
Research and development   60,000    88,000    124,000    161,000 
Selling, general and administrative   280,000    342,000    559,000    626,000 
Total stock-based compensation  $406,000   $492,000   $817,000   $904,000 
Plan summary
Plan   Awards Outstanding 
 2006 Plan    171,000 
 2011 Plan    575,000 
      746,000 
 Awards available for grant as of September 30, 2016    372,000 
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   25,000    4.49           
Options exercised                  
Options forfeited   (15,000)   7.09           
Options expired   (17,000)   22.68           
Outstanding at September 30, 2016   746,000   $20.59    7.44   $2 
Exercisable at September 30, 2016   544,000   $24.91    6.99   $ 
Restricted Stock Award Activity
  

Number of

Shares

  

Weighted

Average Award

Date Fair Value

per Share

 
Unvested restricted stock awards outstanding at April 1, 2016      $ 
Restricted stock awards granted   9,000    4.47 
Restricted stock awards vested   (9,000)   4.47 
Restricted stock awards forfeited        
Unvested restricted stock awards outstanding at September 30, 2016      $