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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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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 |

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