Equity Award Plans (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity under the 2006 Plan and 2013 Plan

A summary of stock option 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 Per Share		(in Years)		Value
Balances at December 31, 2015		5,960		$	7.58		7.85	$	957
Options granted		1,202			2.66		7.07
Options exercised		(213	)		1.64		—
Options forfeited and cancelled		(2,063	)		7.48		—
Balances at September 30, 2016		4,886		$	6.67		6.26	$	403
Options exercisable		3,092		$	7.89		4.65	$	226
Options vested		3,079		$	7.87		4.65	$	226
Options vested and expected to vest		4,738		$	6.75		6.17	$	393

Summary of RSUs Granted and Unvested under the 2013 Plan

A summary of RSUs granted and unvested under the 2013 Plan is as follows:

	RSUs Outstanding
				WeightedAverage
	Number of			Grant Date
	Shares			Fair Value Per Unit
Granted and unvested at December 31, 2015		1,221		$	9.36
RSUs granted		1,534			3.17
RSUs vested		(195	)		7.18
RSUs cancelled and withheld to cover taxes		(995	)		4.98
Granted and unvested at September 30, 2016		1,565		$	4.11