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SHARE-BASED COMPENSATION (Tables)
 9 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of fair value assumptions
The fair values of our employee option awards were estimated using the assumptions below, which yielded the following weighted average grant date fair values for the periods presented:
 
Nine Months Ended March 31, 2019
 
2019
 
2018
Risk-free interest rate
2.5% - 3.0%
 
1.6% - 2.4%
Expected option term in years
3.8 - 5.1
 
3.8 - 4.1
Expected volatility
63.5% - 67.0%
 
66.1% - 67.3%
Dividend yield
0%
 
0%
Weighted average grant date fair value
$9.07
 
$5.81
Summary of stock option activity
The following table summarizes our stock option activity under the Option and Incentive Plan for the nine months ended March 31, 2019:
 
Number of
Options
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding balance at June 30, 2018
15,326,350

 
$
7.68

 
 
 
 
Granted
4,576,163

 
$
16.15

 
 
 
 
Exercised
(2,717,053
)
 
$
5.28

 
 
 
 
Forfeited
(885,692
)
 
$
10.88

 
 
 
 
Expired
(6,000
)
 
$
6.22

 
 
 
 
Outstanding balance at March 31, 2019
16,293,768

 
$
10.29

 
7.8
 
$
229,659

Exercisable at March 31, 2019
5,686,232

 
$
6.87

 
6.1
 
$
99,541
Summary of status of non-vested shares of RSUs
The following table summarizes the status of our unvested RSUs under the Option and Incentive Plan as of March 31, 2019 and changes during the nine months ended March 31, 2019:
 
Number of RSUs
 
Weighted
Average
Grant Date Fair Value
Unvested at June 30, 2018
959,730

 
$
9.28

Granted
617,518

 
15.87

Vested
(252,108
)
 
10.46

Forfeited
(64,845
)
 
12.20

Unvested at March 31, 2019
1,260,295

 
$
12.12