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STOCK BASED COMPENSATION (Tables)
9 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based compensation expense
The following table shows total stock-based compensation expense included in the Condensed Consolidated Statements of Operations for the three and nine months ended March 31, 2015 and 2014 (in thousands):
 
Three Months Ended March 31,
 
Nine Months Ended March 31,
 
2015

2014
 
2015
 
2014
Cost of sales
$
141

 
$
153

 
$
440

 
$
445

Research and development
810

 
630

 
2,499

 
1,679

Sales, general and administrative
425

 
258

 
1,240

 
1,506

 
$
1,376


$
1,041

 
$
4,179

 
$
3,630

Summary of option activity for the company's stock incentive plans
The following is a summary of option activity for the Company’s stock incentive plans for the nine months ended March 31, 2015:
 
Common Stock Options Outstanding
 
Number
of Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
(In thousands)
Balance, June 30, 2014
2,657,142

 
$
2.96

 
 
 
 
Exercised
(203,698
)
 
4.17

 
 
 
 
Forfeitures and cancellations
(25,348
)
 
10.36

 
 
 
 
Balance, March 31, 2015
2,428,096

 
$
2.78

 
4.11
 
$
65,002

Vested and expected to vest as of March 31, 2015
2,418,844

 
$
2.74

 
4.10
 
$
64,837

Vested and exercisable as of March 31, 2015
2,224,808

 
$
1.98

 
3.79
 
$
61,347

Activity of RSUs
The following table summarizes the activity of the RSUs made by the Company:
 
Number of Shares
 
Weighted Average Grant Date Fair Value
Non-vested RSUs, June 30, 2014
549,702

 
$
22.65

RSUs granted
129,801

 
34.13

RSUs vested
(161,711
)
 
21.82

RSUs canceled
(21,912
)
 
22.87

Non-vested RSUs, March 31, 2015
495,880

 
$
25.92