Equity Award Plans (Tables)

12 Months Ended

Dec. 31, 2021

Equity Award Plans [Abstract]

Summary of Stock Option Activity

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

	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, 2019		500		$	23.38		5.77	$	—
Options forfeited and cancelled		(111	)		22.74		—
Balance at December 31, 2020		389		$	23.57		5.77	$	—
Options forfeited and cancelled		(6	)		43.45		—
Balance at December 31, 2021		383		$	23.23		4.85	$	—
Options exercisable as of December 31, 2021		353			24.86		4.63		—
Options vested as of December 31, 2021		353			24.86		4.63		—
Options vested and expected to vest as of December 31, 2021		380			23.36		4.83		—

Summary of RSU Activity

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

	RSUs Outstanding
	Number of Shares			Weighted Average Grant Date Fair Value Per Unit
Granted and unvested at December 31, 2019		1,104		$	4.55
RSUs granted		539			1.50
RSUs vested		(186	)		5.24
RSUs cancelled and withheld to cover taxes		(451	)		4.65
Granted and unvested at December 31, 2020		1,006		$	2.80
RSUs granted		975			5.84
RSUs vested		(264	)		3.08
RSUs cancelled and withheld to cover taxes		(175	)		4.16
Granted and unvested at December 31, 2021		1,542		$	4.60