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Equity Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2016

Stock options are granted under the 2014 Plan and Omnibus Plan as described above. Stock option activity for the year ended December 31, 2016 was as follows (in thousands, except term and per share amounts):

						Weighted-
				Weighted-		Average
	Shares			Average		Remaining		Aggregate
	Underlying			Exercise		Contractual		Intrinsic
	Options			Price		Term		Value
Outstanding—December 31, 2015		9,277		$	1.36			$	76,488
Granted		1,640			3.09
Exercised		(2,679	)		1.08
Cancelled		(4,054	)		1.95
Outstanding—December 31, 2016		4,184		$	1.64		7.3	$	4,876
Options vested and exercisable—December 31, 2016		1,846		$	1.37		6.8	$	2,562
Options vested and expected to vest—December 31, 2016		3,868		$	1.62		7.2	$	4,616

Stock Option Activity By Range Of Exercise Price

The following table summarizes stock option activity by range of exercise price as of December 31, 2016 (number of awards in thousands):

	Awards Outstanding					Awards Exercisable
			Weighted-Average
	Number of Awards		Remaining	Weighted-Average		Number of Awards		Weighted-Average
Range of Exercise Price	Outstanding		Contractual Life	Exercise Price		Exercisable		Exercise Price
$0.00 - $1.00		2,002	6.6	$	1.00		1,080	$	1.00
$1.01 - $2.00		1,418	7.1		1.30		710		1.30
$2.01 - $10.00	685		9.8		2.98		21		4.14
$10.01 - $16.00	79		8.3		12.63		35		12.64
Total		4,184	7.3	$	1.64		1,846	$	1.37

Weighted Average Assumptions to Estimate Fair Value of Stock Options

The fair values using the Black-Scholes-Merton method were estimated on each grant date using the following weighted-average assumptions:

	Year Ended December 31,
	2016			2015			2014
Expected term (in years)		5.8			6.2			6.2
Volatility		83.1	%		89.0	%		87.1	%
Risk-free interest rate		1.7	%		1.8	%		1.9	%
Dividend yield		0.0	%		0.0	%		0.0	%

Restricted Stock Units Activity

RSUs are granted under the 2014 Plan and the LTIP as described above. RSU activity for the year ended December 31, 2016 was as follows (awards in thousands):

				Weighted-
				Average
	Number of			Grant Date
	Awards			Fair Value
Outstanding at December 31, 2015		930		$	12.84
Granted		9,180			2.68
Vested		(990	)		6.97
Forfeited		(1,156	)		4.00
Outstanding at December 31, 2016		7,964		$	3.14

Summary of Stock-Based Compensation Expense

Stock-based compensation was included in operating expenses as follows (in thousands):

	Year Ended December 31,
	2016			2015		2014
Cost of revenue	$	2,428		$	3,068	$	1,105
Sales and marketing		2,980			10,737		860
General and administrative		5,716			11,310		21,722
Research and development		(510	)		489		—
Total stock-based compensation	$	10,614		$	25,604	$	23,687

Summary of Unrecognized Stock-Based Compensation Expense

Unrecognized stock-based compensation expense, net of estimated forfeitures, for time-based stock options, performance-based stock options, RSUs and PSUs as of December 31, 2016 was as follows (in thousands, except years):

	Unrecognized
	Stock-Based		Weighted-
	Compensation		Average Period
	Expense		of Recognition
Time-based stock options	$	2,693	2.8 years
RSUs and PSUs		12,536	1.8 years
Total unrecognized stock-based compensation expense as of December 31, 2016	$	15,229

Monte Carlo Simulation Method

Weighted Average Assumptions to Estimate Fair Value of Stock Options

The fair values using the Monte Carlo Simulation method were estimated on each grant date using the following weighted-average assumptions:

	Year Ended
	December 31,
	2014
Volatility		80.0	%
Risk-free interest rate		2.7	%