Equity Award Plans (Tables)

12 Months Ended

Dec. 31, 2016

A summary of activity under the 2006 Plan and the 2013 Plan is as follows (in thousands, except per share amounts and years):

	Options Outstanding
	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (in Years)		Aggregate Intrinsic Value
Balance at December 31, 2013		4,855		$	6.56		7.85	$	20,593
Options granted		3,558			9.39		8.35
Options exercised		(791	)		3.12		—
Options forfeited and cancelled		(1,246	)		9.51		—
Balance at December 31, 2014		6,376		$	7.99		7.82	$	9,697
Options granted		2,303			5.85		7.70
Options exercised		(727	)		1.98		—
Options forfeited and cancelled		(1,992	)		8.92		—
Balance at December 31, 2015		5,960		$	7.58		7.85	$	957
Options granted		1,202			2.66		6.82
Options exercised		(264	)		1.48		—
Options forfeited and cancelled		(3,149	)		7.79		—
Balance at December 31, 2016		3,749		$	6.26		7.48	$	194
Options exercisable as of December 31, 2016		2,178		$	7.70		6.49	$	110
Options vested as of December 31, 2016		2,174		$	7.69		6.49	$	110
Options vested and expected to vest as of December 31, 2016		3,636		$	6.33		7.44	$	192

A summary of RSUs granted and unvested under the 2013 Plan during 2016 and 2015 is as follows (in thousands, except per unit amounts):

	RSUs Outstanding
	Number of Shares			Weighted Average Grant Date Fair Value Per Unit
Granted and unvested at December 31, 2013		—		$	—
RSUs granted		777			9.37
RSUs vested		—			—
RSUs cancelled		(8	)		10.56
Granted and unvested at December 31, 2014		769		$	9.36
RSUs granted		1,185			5.68
RSUs vested		(143	)		9.83
RSUs cancelled and withheld to cover taxes		(590	)		7.79
Granted and unvested at December 31, 2015		1,221		$	9.36
RSUs granted		3,123			2.68
RSUs vested, net		(209	)		7.19
RSUs cancelled and withheld to cover taxes		(1,132	)		4.40
Granted and unvested at December 31, 2016		3,003		$	3.07