Equity Award Plans (Tables)

6 Months Ended

Jun. 30, 2019

Equity Award Plans [Abstract]

Summary of Stock Option Activity

A summary of stock option activity under the 2006 Plan and 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, 2018		436		$	29.01		6.79	$	—
Options granted		128			4.00		9.87		—
Options forfeited and cancelled		(11	)		67.56		—		—
Balances at June 30, 2019		553			22.48		6.60		—
Options exercisable		350			31.75		5.97		—
Options vested		350			31.75		5.97		—
Options vested and expected to vest		525			23.33		7.06		—

Summary of RSUs Granted and Unvested

A summary of RSUs granted and unvested 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, 2018		834		$	7.99
RSUs granted		646			4.18
RSUs vested		(74	)		10.01
RSUs cancelled and withheld to cover taxes		(254	)		7.19
Granted and unvested at June 30, 2019		1,152		$	5.90