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STOCK INCENTIVE PLANS AND STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of share-based compensation
The following tables summarize stock-based compensation expense (in thousands):
 
  
Three months ended June 30,
 
  
2019
  
2018
 
Stock-based compensation expense:
        
Cost of revenue
 $101  $75 
Research and development
  138   86 
Sales and marketing
  297   (148
General and administrative
  451   414 
  
 
 
  
 
 
 
Total stock-based compensation expense
 $987  $427 
  
 
 
  
 
 
 
  
  
Three months ended June 30,
 
  
2019
  
2018
 
Stock-based compensation by type of award:
        
Restricted stock
 $711  $557 
Performance share units
  276   (197
Stock purchase plan
     107 
Stock options
     (40
  
 
 
  
 
 
 
Total stock-based compensation expense
 $987  $427 
  
 
 
  
 
 
 
Summary of activity relating to performance share
A summary of activity relating to
Quantum’s
PSUs is as follows (shares in thousands):
 
  
Shares
  
Weighted-Average Grant

Date Fair Value Per Share
 
Nonvested as of March 31, 2019
  770  $1.78 
Granted
  175  $1.71 
Forfeited
  (10 $3.36 
  
 
 
     
Nonvested as of June 30, 2019
  935  $1.75 
  
 
 
     
Summary of activity relating to restricted stock
A summary of activity relating to
Quantum’s
RSUs is as follows (shares in thousands):
 
  
Shares
  
Weighted-Average Grant

Date Fair Value Per Share
 
Nonvested as of March 31, 2019
  1,311  $3.61 
Granted
  210  $2.45 
Vested
  (6 $8.76 
Forfeited
  (30 $7.24 
  
 
 
     
Nonvested as of June 30, 2019
  1,485  $3.35