Equity Award Plans (Tables)

6 Months Ended

Jun. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of the Activity for Stock Option Changes and Summary of Information Related to Options Vested and Expected to Vest and Options Exercisable

A summary of the activity for our stock option changes during the reporting period and a summary of information related to options vested and options exercisable are presented below (in thousands, except per share amounts and contractual life years):

	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price (per share)		Weighted- Average Contractual Life (years)	Aggregate Intrinsic Value
Balance — December 31, 2016	8,085		$	10.7	5.4	$	40,304
Exercised	(2,337	)	4.79			19,866
Cancelled	(274	)	32.67
Balance — June 30, 2017	5,474		$	12.13	5.1	$	38,620
Options exercisable — June 30, 2017	5,330		$	11.60	5.1	$	38,346

Summary of Activity for Restricted Common Stock, RSAs and RSUs and Summary of Information Related to Unvested Restricted Common Stock, RSAs and RSUs and those Expected to Vest

A summary of the activity for our restricted common stock, RSAs and RSUs, including those subject to performance conditions, during the reporting period and a summary of information related to unvested restricted common stock, RSAs and RSUs, including those with vesting subject to the achievement of a performance condition, are presented below (in thousands, except per share amounts and contractual life years):

	Number of Shares		Weighted- Average Grant Date Fair Value (per share)		Weighted- Average Contractual Life (years)	Aggregate Intrinsic Value
Unvested balance — December 31, 2016	19,883		$	22.23	1.5	$	236,605
Granted	10,686		11.75
Vested	(4,186	)	23.26
Cancelled	(4,389	)	16.80
Unvested balance — June 30, 2017	21,994		$	17.67	1.6	$	334,534
Unvested awards for which the requisite service period has not been rendered and vesting is subject to the achievement of a performance condition — June 30, 2017	4,340		$	16.82	2.0	$	66,012

Schedule of Assumptions used in Black-Scholes Option Pricing Model

The following table summarizes the assumptions used in the Black-Scholes option-pricing model to determine fair value of our common shares to be issued under the ESPP for the offering periods beginning in May 2017:

	Three and Six Months Ended June 30, 2017	Three and Six Months Ended June 30, 2016
Fair value of common stock	$15.65	$11.15
Risk-free interest rate	1.05% - 1.12%	0.38% - 0.57%
Expected term (in years)	0.5 - 1.0	0.5 - 1.0
Volatility	51%	61%
Dividend yield	—%	—%

Schedule of Stock-Based Compensation Expense Related to Stock Options, ESPP and Restricted Stock Units and Awards

Stock-based compensation expense related to stock options, ESPP and restricted stock units and awards is included in the condensed consolidated statements of operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Cost of product revenue	$	519	$	614	$	1,054	$	1,281
Cost of subscription and services revenue	6,873		7,653		14,370		17,254
Research and development	14,057		19,025		28,582		43,455
Sales and marketing	10,219		17,606		24,234		33,760
General and administrative	7,729		12,410		15,046		25,625
Total	$	39,397	$	57,308	$	83,286	$	121,375