Share Based Awards (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure Of Compensation Related Costs Share based Payments [Abstract]

Schedule of Restricted Stock Unit Activity

	Restricted Stock Units
		Weighted-
		Average
	Number of	Grant Date
	Shares	Fair Value
Unvested, December 31, 2016	10,474,975	$	4.45
Granted	9,669,478		5.20
Vested	(4,948,583)		4.67
Forfeitures	(1,954,759)		5.12
Unvested, September 30, 2017	13,241,111	$	4.82

Schedule of Stock Option Activity

		Options Outstanding
						Weighted-
	Number of					Average	Aggregate
	Shares		Weighted-			Remaining	Intrinsic
	Available	Number of	Average		Contractual		Value
	for Issuance	Shares	Exercise Price			Term (Years)	(In thousands)
Balance—December 31, 2016	4,199,415	9,835,992	$	4.39		6.23	$	5,734
Authorized	4,453,425	—
Stock options granted	(100,000)	100,000		4.90
Issuance of shares under 2016 Bonus Plans	(1,688,077)	—
Shares withheld from net settlement of restricted stock units	677,547
Restricted stock units granted	(7,981,401)	—
Exercised	—	(1,033,121)		2.99
Stock options canceled	1,006,137	(1,006,137)		6.31
Restricted stock units canceled	1,954,759	—
Balance—September 30, 2017	2,521,805	7,896,734	$	4.34		4.84	$	4,387
Vested and exercisable—September 30, 2017		6,593,808	$	4.26			$	4,147
Vested and expected to vest(1)—September 30, 2017		7,752,157	$	4.34			$	4,354

(1) Options expected to vest reflect an estimated forfeiture rate.

Schedule of Stock-based Compensation Expense Recognized (in thousands)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Cost of revenue	$	932	$	747	$	2,859	$	2,192
Research and development		3,914		2,709		11,046		9,122
Sales and marketing		2,258		2,307		6,612		8,418
General and administrative		1,974		2,109		5,732		6,934
Total	$	9,078	$	7,872	$	26,249	$	26,666

Schedule of Assumptions Used for Calculating the Fair Value of Employee Option Grants

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
Expected dividend yield	n/a	—	—	—
Risk-free interest rate	n/a	1.5%	2.1%	1.4  -1.5%
Expected volatility	n/a	42%	41%	42%
Expected life (in years)	n/a	6.1	6.1	6.1

Schedule of Assumptions Used for Calculating the Fair Value of Employee stock purchase plans

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
Expected dividend yield	—	—	—	—
Risk-free interest rate	1.3%	0.6%	0.9 - 1.3%	0.6%
Expected volatility	54%	34-38%	34%  -54%	34 - 41%
Expected life (in years)	1.3	1.3	1.3	1.3

Schedule of Unrecognized Stock-Based Compensation Expense and Its Remaining Weighted-Average Recognition Period

	Unrecognized		Remaining
	Stock-based		Weighted-Average
	Compensation		Recognition
	Expense		Period
	(in millions)		(in years)
Stock options	$	2.1	1.8
Restricted stock units		52.7	2.9
ESPP		1.7	0.6
Total	$	56.5