v3.8.0.1

STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of total shares available for grant

The following table summarizes the total number of shares available for grant under the 2014 Plan as of September 30, 2017:

	Shares Available for Grant
Balance, December 31, 2016	5,116,753
Authorized	2,612,263
Options granted	—
Options canceled	1,436,112
Awards granted	(3,287,665	)
Awards canceled	1,595,966
Balance, September 30, 2017	7,473,429

Summary of shares available for grant and outstanding stock option activity

The following table summarizes the information about outstanding stock option activity:

	Options Outstanding
	Number of Shares Underlying Outstanding Options			Weighted Average Exercise  Price				Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
										(in thousands)
Balance, December 31, 2016	6,219,774			$	6.15			6.42		$	6,056
Options granted	—			—
Options exercised	(409,065	)		1.73
Options canceled	(1,436,112	)		7.74
Balance, September 30, 2017	4,374,597			$	6.04			6.07		$	2,732
Options exercisable, September 30, 2017	3,439,751			$	5.81			5.57		$	2,732

Summary of RSU activity and related information

summary of the Company’s RSU activity and related information for the three months ended September 30, 2017:

	Restricted Stock Units Outstanding
	Shares			Weighted-Average Grant-Date Fair Value Per Share
Balance, December 31, 2016	4,365,670			$	6.23
Awards granted	3,287,665			4.96
Awards vested	(1,453,616	)		5.92
Awards canceled	(1,320,044	)		6.14
Balance, September 30, 2017	4,879,675			$	5.49

Summary of the assumptions related to stock options

Weighted-average assumptions for the Company's stock options granted were as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Stock options:
Expected term (in years)	N/A		5.85			N/A		5.78
Expected volatility	N/A		53.18	%		N/A		55.09	%
Risk free interest rate	N/A		1.15	%		N/A		1.49	%

Schedule of share based payment award, equity other than options, valuation [Table Text Block]

Weighted-average assumptions to value MBRSUs under the Monte Carlo model were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017			2016
MBRSUs:
Expected volatility	N/A		N/A		46	%		53	%
Risk free interest rate	N/A		N/A		1.45	%		1.07	%

Weighted average assumptions used to value employee stock purchase rights

Weighted-average assumptions to value employee stock purchase rights under the Black-Scholes model were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
ESPP purchase rights:
Expected term (in years)	0.50 - 1.00		0.50 - 2.00		0.50 - 1.00		0.50 - 2.00
Expected volatility	34% - 39%		35% - 55%		34% - 39%		35% - 55%
Risk free interest rate	0.60% - 1.07%		0.07% - 0.51%		0.60% - 1.07%		0.07% - 0.51%

Schedule of stock-based awards granted in the consolidated statements of operations

The total stock-based compensation the Company recognized for stock-based awards in the consolidated statements of operations is as follows:

	Three Months Ended September 30,								Nine Months Ended September 30,
	2017				2016				2017				2016
	(in thousands)
Cost of revenue	$	313			$	431			$	860			$	1,024
Research and development	1,329				1,576				3,082				4,287
Sales and marketing	1,566				2,505				4,361				6,336
General and administrative	1,756				1,903				4,658				5,118
Total stock-based compensation	$	4,964			$	6,415			$	12,961			$	16,765

The following table presents stock-based compensation expense by award-type:

	Three Months Ended September 30,								Nine Months Ended September 30,
	2017				2016				2017				2016
	(in thousands)
Stock Options	$	652			$	1,336			$	2,355			$	3,667
Restricted Stock Units	3,945				4,353				9,408				11,044
Employee Stock Purchase Plan	367				726				1,198				2,054
Total stock-based compensation	$	4,964			$	6,415			$	12,961			$	16,765

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