Share Based Awards (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased 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	4,397,129		4.58
Vested	(2,605,203)		4.83
Forfeitures	(707,927)		5.42
Unvested, March 31, 2017	11,558,974	$	4.35

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	(2,709,052)	—
Exercised	—	(392,606)		2.58
Stock options canceled	765,252	(765,252)		6.14
Restricted stock units canceled	707,927	—
Balance—March 31, 2017	6,306,437	8,778,134	$	4.33		5.33	$	7,974
Vested and exercisable—March 31, 2017		6,846,658	$	4.13			$	7,090
Vested and expected to vest(1)—March 31, 2017		8,538,551	$	4.32			$	7,836

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

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

	Three Months Ended
	March 31,
	2017		2016
Cost of revenue	$	701	$	390
Research and development		2,766		2,601
Sales and marketing		1,772		3,119
General and administrative		1,308		2,139
Total	$	6,547	$	8,249

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

	Three Months Ended
	March 31,
	2017	2016
Expected dividend yield	—	—
Risk-free interest rate	2.1%	1.4%
Expected volatility	41%	42%
Expected life (in years)	6.1	6.1

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

	Three Months Ended
	March 31,
	2017	2016
Expected dividend yield	—	—
Risk-free interest rate	0.9%	0.6%
Expected volatility	34%	39%
Expected life (in years)	1.3	1.3

Schedule of Unrecognized Stock-based Compensation Related to Nonvested Awards

	Unrecognized		Remaining
	Stock-based		Weighted-Average
	Compensation		Recognition
	Expense		Period
	(in millions)		(in years)
Stock options	$	3.4	2.1
Restricted stock units		38.3	2.9
ESPP		1.2	0.6
Total	$	42.9