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STOCK BASED COMPENSATION (Tables)
 6 Months Ended
Dec. 31, 2018
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 (Loss) for the three and six months ended December 31, 2018 and 2017 (in thousands):
 Three Months Ended December 31,Six Months Ended December 31,
 2018201720182017
Cost of revenues$261 $40 $294 $285 
Research and development497 370 964 826 
Sales, general and administrative21 370 296 581 
$779 $780 $1,554 $1,692 
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 six months ended December 31, 2018:
 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, 2018137,491 $9.15 3.62$10,390 
Exercised(36,126)$10.55 
Balance, December 31, 2018101,365 $8.66 3.12$9,199 
Vested as of December 31, 2018101,365 $8.66 3.12$9,199 
Vested and exercisable as of December 31, 2018101,365 $8.66 3.12$9,199 
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 Per Share 
Non-vested RSUs, June 30, 2018144,100 $53.24 
RSUs granted39,261 $89.51 
RSUs vested(21,673)$49.57 
RSUs canceled(20,603)$57.95 
Non-vested RSUs, December 31, 2018141,085 $63.21