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Stock-based Compensation and Stockholders' Equity (Tables)
 9 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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 nine months ended March 31, 2017 and 2016 was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:
 
Three Months Ended
March 31,
 
Nine Months Ended
March 31,
 
2017
 
2016
 
2017
 
2016
Risk-free interest rate
2.03
%
 
1.38% - 1.48%

 
1.12% - 2.03%

 
1.38% - 1.57%

Expected term
5.31 years

 
5.31 years

 
5.31 - 5.38 years

 
5.31 - 5.33 years

Dividend yield
—
%
 
—
%
 
—
%
 
—
%
Volatility
43.84% - 49.12%

 
49.09% - 50.89%

 
43.84% - 49.64%

 
47.06% - 50.89%

Weighted-average fair value
$
12.72

 
$
12.99

 
$
10.90

 
$
12.04
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 nine months ended March 31, 2017 and 2016 (in thousands):
 
 
Three Months Ended
March 31,
 
Nine Months Ended
March 31,
 
2017
 
2016
 
2017
 
2016
Cost of sales
$
334

 
$
294

 
$
968

 
$
792

Research and development
3,069

 
2,549

 
8,989

 
7,423

Sales and marketing
541

 
491

 
1,539

 
1,330

General and administrative
889

 
552

 
2,550

 
2,223

Stock-based compensation expense before taxes
4,833

 
3,886

 
14,046

 
11,768

Income tax impact
(1,549
)
 
(1,191
)
 
(4,270
)
 
(3,290
)
Stock-based compensation expense, net
$
3,284

 
$
2,695

 
$
9,776

 
$
8,478
Summary of stock option activity
The following table summarizes stock option activity during the nine months ended March 31, 2017 under all plans:
 
 
 
Options
Outstanding
 
Weighted
Average
Exercise
Price per
Share
 
Weighted
Average
Remaining
Contractual
Term
(in Years)
 
Aggregate
Intrinsic
Value
(in thousands)
Balance as of June 30, 2016 (7,495,131 shares exercisable at weighted average exercise price of $13.35 per share)
 
8,960,867

 
$
14.88

 
 
 
 
Granted (weighted average fair value of $10.90)
 
341,400

 
$
24.11

 
 
 
 
Exercised
 
(827,875
)
 
$
11.02

 
 
 
 
Forfeited
 
(24,011
)
 
$
20.76

 
 
 
 
Balance as of March 31, 2017
 
8,450,381

 
$
15.62

 
4.90
 
$
86,351

Options vested and expected to vest at March 31, 2017
 
8,378,933

 
$
15.53

 
4.86
 
$
86,238

Options vested and exercisable at March 31, 2017
 
7,364,413

 
$
14.29

 
4.41
 
$
83,637
Summary of restricted stock unit activity
The following table summarizes RSUs activity during the nine months ended March 31, 2017 under all plans: 
 
RSUs
Outstanding
 
Weighted
Average
Grant-Date Fair Value per Share
 
Aggregate
Intrinsic
Value
(in thousands)
Balance as of June 30, 2016
926,983

 
$
30.23

 
 
Granted
613,310

 
$
23.42

 
 
Released
(285,037
)
 
$
27.45

 
 
Forfeited
(81,869
)
 
$
26.67

 
 
Balance as of March 31, 2017
1,173,387

 
$
27.59

 
$
29,745