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STOCK BASED COMPENSATION (Tables)
12 Months Ended
Jun. 30, 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 Consolidated Statements of Operations and Comprehensive Income for fiscal 2015, 2014 and 2013 (in thousands):
 
Years Ended Years Ended June 30,
 
2015

2014
 
2013
Cost of sales
$
601

 
$
590

 
$
446

Research and development
2,854

 
2,423

 
1,433

Sales, general and administrative
1,537

 
1,893

 
1,497

 
$
4,992


$
4,906

 
$
3,376

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 2015, 2014 and 2013:
 
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, 2012
3,347,445

 
$
1.45

 
6.62
 
$
42,920

Granted
683,500

 
11.29

 
 
 
 
Exercised
(266,558
)
 
2.39

 
 
 
 
Forfeitures and cancellations
(150,125
)
 
5.68

 
 
 
 
Balance, June 30, 2013
3,614,262

 
$
3.07

 
6.17
 
$
52,330

Exercised
(849,635
)
 
2.46

 
 
 
 
Forfeitures and cancellations
(107,485
)
 
10.55

 
 
 
 
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

Vested and expected to vest as of June 30, 2015
2,295,811

 
$
2.36

 
3.81
 
$
67,860

Vested and exercisable as of June 30, 2015
2,167,482

 
$
1.83

 
3.60
 
$
65,224

Stock options outstanding by exercise price range
Additional information regarding options outstanding as of June 30, 2015 is as follows (in thousands, except weighted average exercise price amounts and contractual life):
 
 
Options Outstanding
 
 
 
Options Exercisable
Range of Exercise Prices
 
Number of
Options
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Exercise
Price
 
Number of
Options
 
Weighted
Average
Exercise
Price
$0.01 - $1.91
 
1,654,160

 
2.76
 
$
0.05

 
1,654,160

 
$
0.05

$1.92 - $10.76
 
292,352

 
5.53
 
4.49

 
291,828

 
4.49

$10.77 - $11.74
 
260,250

 
7.37
 
10.77

 
161,496

 
10.77

$11.75 - $18.48
 
87,788

 
7.32
 
13.17

 
54,377

 
13.29

$18.49 - $19.98
 
3,907

 
6.47
 
18.55

 
3,301

 
18.55

$19.99 - $26.28
 
2,687

 
5.48
 
21.55

 
2,320

 
21.55

$0.01 – $26.28
 
2,301,144

 
3.82
 
$
2.38

 
2,167,482

 
$
1.83

Fair value of employee stock options
For fiscal 2013 the fair value of employee stock options was estimated using the following weighted average assumptions:
 
 
Year Ended June 30, 2013
Expected term
 
6.1 years

Expected volatility
 
52
%
Risk-free interest rate
 
0.9
%
Expected dividend yield
 

Weighted average grant date fair value
 
$
5.57

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, 2012
453,620

 
$
9.42

RSUs granted
656,500

 
14.11

RSUs vested
(70,512
)
 
14.14

RSUs canceled
(294,702
)
 
5.29

Non-vested RSUs, June 30, 2013
744,906

 
$
14.74

RSUs granted
209,032

 
37.87

RSUs vested
(170,197
)
 
15.59

RSUs canceled
(234,039
)
 
16.18

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