Equity Award Plans (Tables)

6 Months Ended

Jun. 30, 2022

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
Balances at December 31, 2021		383		$	23.23		4.85	$	—
Options forfeited and cancelled		(42	)		49.24		—		—
Balances at June 30, 2022		341			20.05		4.90		—
Options exercisable		326			20.78		4.81		—
Options vested		326			20.78		4.81		—
Options vested and expected to vest		341			20.05		4.90		—

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, 2021		1,542		$	4.60
RSUs granted		728			1.95
RSUs vested		(342	)		2.23
RSUs cancelled and withheld to cover taxes		(69	)		6.56
Granted and unvested at June 30, 2022		1,859		$	3.93