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Stock-based Compensation (Tables)
6 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of assumptions used to estimate fair value of stock options granted using Black-Scholes option pricing model
The fair value of stock option grants for the three and six months ended December 31, 2019 and 2018 was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:
 
Three Months Ended
December 31,
 
Six Months Ended
December 31,
 
2019
 
2018
 
2019
 
2018
Risk-free interest rate
1.72
%
 
2.97
%
 
1.58% - 1.72%

 
2.87% - 2.97%

Expected term
6.27 years

 
6.05 years

 
6.27 years

 
6.05 years

Dividend yield
%
 
%
 
%
 
%
Volatility
49.74
%
 
50.02
%
 
49.74% - 50.04%

 
47.34% - 50.02%

Weighted-average fair value
$
10.30

 
$
6.62

 
$
9.14

 
$
8.77


Schedule of stock-based compensation expense
The following table shows total stock-based compensation expense included in the condensed consolidated statements of operations for the three and six months ended December 31, 2019 and 2018 (in thousands):
 
 
Three Months Ended
December 31,
 
Six Months Ended
December 31,
 
2019
 
2018
 
2019
 
2018
Cost of sales
$
384

 
$
428

 
$
779

 
$
866

Research and development
3,126

 
3,212

 
6,256

 
6,708

Sales and marketing
423

 
436

 
859

 
941

General and administrative
1,031

 
1,171

 
2,124

 
2,606

Stock-based compensation expense before taxes
4,964

 
5,247

 
10,018

 
11,121

Income tax impact
(1,131
)
 
(1,082
)
 
(2,283
)
 
(2,324
)
Stock-based compensation expense, net
$
3,833

 
$
4,165

 
$
7,735

 
$
8,797


Summary of stock option activity
The following table summarizes stock option activity during the six months ended December 31, 2019 under all plans:
 
 
 
Options
Outstanding
 
Weighted
Average
Exercise
Price per
Share
 
Weighted
Average
Remaining
Contractual
Term (in Years)
Balance as of June 30, 2019
 
7,374,635

 
$
18.02

 
 
Granted
 
160,600

 
$
18.44

 
 
Exercised
 
(288,985
)
 
$
14.04

 
 
Forfeited/Cancelled
 
(358,006
)
 
$
8.69

 
 
Balance as of December 31, 2019
 
6,888,244

 
$
18.68

 
3.77
Options vested and exercisable at December 31, 2019
 
6,152,154

 
$
18.46

 
3.19

Summary of restricted stock unit activity
The following table summarizes RSUs and PRSUs activity during the six months ended December 31, 2019 under all plans: 
 
Time-Based RSUs
Outstanding
 
Weighted
Average
Grant-Date Fair Value per Share
 
PRSUs
Outstanding
 
 
Weighted
Average
Grant-Date Fair Value per Share
Balance as of June 30, 2019
1,873,102

 
$
20.25

 
120,000

(1)
 
$
27.10

Granted
571,200

 
$
18.91

 

 
 
 
Released (2)
(508,979
)
 
$
20.96

 

 
 
 
Forfeited
(86,559
)
 
$
18.49

 

 
 
 
Balance as of December 31, 2019
1,848,764

 
$
19.72

 
120,000

 
 
$
27.10


__________________________
(1)
Reflects the number of PRSUs that have been earned based on the achievement of performance metrics.
(2)
The number of shares released excludes 96,000 PRSUs that were vested but not released as of December 31, 2019, of which 6,000 PRSUs vested during the three months ended December 31, 2019.