Stock-based Compensation and Stockholders' Equity (Tables)

6 Months Ended

Dec. 31, 2015

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 six months ended December 31, 2015 and 2014 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,
	2015			2014			2015			2014
Risk-free interest rate	1.42		%	1.50		%	1.42% - 1.57%			1.50% - 1.76%
Expected term	5.31 years			5.44 years			5.31 - 5.33 years			5.44 years
Dividend yield	—		%	—		%	—		%	—		%
Volatility	49.46		%	49.31		%	47.06% - 49.46%			46.93% - 49.31%
Weighted-average fair value	$	11.50		$	11.64		$	11.54		$	11.69

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, 2015 and 2014 (in thousands):

	Three Months Ended December 31,						Six Months Ended December 31,
	2015			2014			2015			2014
Cost of sales	$	258		$	222		$	498		$	429
Research and development	2,472			1,997			4,874			3,893
Sales and marketing	435			414			839			779
General and administrative	841			548			1,671			1,060
Stock-based compensation expense before taxes	4,006			3,181			7,882			6,161
Income tax impact	(1,814		)	(785		)	(2,099		)	(1,392		)
Stock-based compensation expense, net	$	2,192		$	2,396		$	5,783		$	4,769

Summary of stock option activity

The following table summarizes stock option activity during the six months ended December 31, 2015 under all stock option 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, 2015 (7,208,475 shares exercisable at weighted average exercise price of $12.24 per share)	9,702,843		$	14.21
Granted (weighted average fair value of $11.54)	184,790		$	25.78
Exercised	(269,320	)	$	9.06
Forfeited	(25,878	)	$	19.11
Balance as of December 31, 2015	9,592,435		$	14.57	5.55	$	99,668
Options vested and expected to vest at December 31, 2015	9,420,529		$	14.41	5.49	$	99,053
Options vested and exercisable at December 31, 2015	7,663,628		$	12.91	4.86	$	89,777

Summary of restricted stock unit activity

The following table summarizes restricted stock unit activity during the six months ended December 31, 2015 under the 2006 Plan: 

	Restricted Stock Units Outstanding		Weighted Average Grant-Date Fair Value per Share		Aggregate Intrinsic Value (in thousands)
Balance as of June 30, 2015	303,324		$	36.02
Granted	445,750		$	28.76
Vested	(52,006	)	$	34.34
Forfeited	(27,606	)	$	31.18
Balance as of December 31, 2015	669,462		$	31.51	$	16,409