Equity Award Plans (Tables)

3 Months Ended

Mar. 31, 2023

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, 2022		337		$	19.59		4.45	$	—
Options forfeited and cancelled		(8	)		84.29		—		—
Balances at March 31, 2023		329			18.03		4.31		—
Options exercisable		314			18.70		4.22		—
Options vested		314			18.70		4.22		—
Options vested and expected to vest		329			18.03		4.31		—

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, 2022		1,814		$	2.99
RSUs granted		1,464			1.24
RSUs vested		(14	)		3.34
RSUs cancelled and withheld to cover taxes		(29	)		3.13
Granted and unvested at March 31, 2023		3,235		$	2.19