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STOCK BASED COMPENSATION (Tables)
 12 Months Ended
Jun. 30, 2017
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 Consolidated Statements of Operations and Comprehensive Income for fiscal 2017, 2016 and 2015 (in thousands):
 
Years Ended June 30,
 
2017

2016
 
2015
Cost of revenues
$
264

 
$
448

 
$
601

Research and development
1,861

 
2,296

 
2,854

Sales, general and administrative
660

 
975

 
1,537

 
$
2,785


$
3,719

 
$
4,992
Option activity for Company's stock incentive plans
The following is a summary of option activity for the Company’s stock incentive plans for fiscal 2017, 2016 and 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

 
5.11
 
$
112,215

Exercised
(299,034
)
 
$
5.64

 
 
 
 
Forfeitures and cancellations
(56,964
)
 
$
12.14

 
 
 
 
Balance, June 30, 2015
2,301,144

 
$
2.38

 
3.82
 
$
67,969

Exercised
(171,263
)
 
$
6.46

 
 
 
 
Forfeitures and cancellations
(4,574
)
 
$
13.82

 
 
 
 
Balance, June 30, 2016
2,125,307

 
$
2.03

 
2.65
 
$
77,850

Exercised
(502,350
)
 
$
2.86

 
 
 
 
Forfeitures and cancellations
(1,356
)
 
$
11.72

 
 
 
 
Balance, June 30, 2017
1,621,601

 
$
1.76

 
1.55
 
$
81,413

Vested and expected to vest as of June 30, 2017
1,621,601

 
$
1.76

 
1.55
 
$
81,413

Vested and exercisable as of June 30, 2017
1,621,601

 
$
1.76

 
1.55
 
$
81,413
Stock options outstanding by exercise price range
Additional information regarding options outstanding as of June 30, 2017 is as follows:
 
 
Options Outstanding & Exercisable
 
 
Range of Exercise Prices
 
Number of
Options
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Exercise
Price
$0.01 - $10.76
 
1,397,128

 
0.93
 
$
0.26

$10.77 - $14.99
 
214,228

 
5.38
 
$
10.90

$15.00 - $16.75
 
4,645

 
4.84
 
$
15.02

$16.76 - $18.70
 
4,350

 
5.38
 
$
17.46

$18.71 - $19.99
 
1,250

 
4.38
 
$
19.22

 
 
1,621,601

 

 
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
182,865

 
$
32.47

RSUs vested
(182,507
)
 
$
21.27

RSUs canceled
(149,425
)
 
$
24.84

Non-vested RSUs, June 30, 2015
400,635

 
$
26.95

RSUs granted
132,746

 
$
31.38

RSUs vested
(141,159
)
 
$
23.54

RSUs canceled
(120,251
)
 
$
31.84

Non-vested RSUs, June 30, 2016
271,971

 
$
28.72

RSUs granted
72,023

 
$
55.33

RSUs vested
(120,649
)
 
$
25.29

RSUs canceled
(42,972
)
 
$
33.45

Non-vested RSUs, June 30, 2017
180,373

 
$
40.51