Equity Award Plans (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity Under the 2006 Plan and 2013 Plan

A summary of activity under the 2006 Plan and 2013 Plan is as follows:

	Options Outstanding
						Weighted
						Average
				Weighted		Remaining
				Average		Contractual		Aggregate
	Number of			Exercise		Term		Intrinsic
	Shares			Price		(in Years)		Value
Balances at December 31, 2012		4,314		$	4.17		7.61	$	34,439
Options granted		1,417			12.09		9.45
Options exercised		(451	)		2.54		—
Options forfeited and cancelled		(290	)		8.18		—
Balances at September 30, 2013		4,990		$	6.33		7.99	$	31,125
Options exercisable as of September 30, 2013		4,342		$	5.72		7.79	$	29,664
Options vested as of September 30, 2013		2,146		$	2.93		6.83	$	20,648
Options vested and expected to vest of September 30, 2013		4,737		$	6.16		7.93	$	30,373