Stock Benefit Plans and Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

A summary of the Company’s stock option activity under the Plans and related information is as follows (in thousands, except as indicated and per share data), as adjusted for the 1-for-12 reverse stock split:

	Shares			Weighted average exercise price		Weighted average remaining contractual term (in years)		Aggregate intrinsic value
Outstanding at December 31, 2016		1,155		$	12.17		7.75	$	—
Granted		2,878		$	2.00
Forfeited		(877	)	$	7.08
Outstanding at December 31, 2017		3,156		$	4.31		8.28	$	1,841
Options vested and exercisable at December 31, 2017		535		$	14.05		4.55	$	45
Options vested and expected to vest at December 31, 2017		2,776		$	4.59		8.17	$	1,573

Summary of Information about Restricted Stock Awards, Restricted Stock Units and Performance-Based Restricted Units Activity (Detail)

The following table summarizes information about the restricted stock awards, restricted stock units and performance-based restricted units activity (in thousands, except as indicated and per share data), as adjusted for the 1-for-12 reverse stock split:

	Shares			Weighted average grant date fair value		Weighted average remaining recognition period (in years)
Unvested at December 31, 2016		1,092		$	7.48		3.02
Awarded		1,517		$	2.96
Vested		(258	)	$	5.07
Forfeited		(351	)	$	8.90
Unvested at December 31, 2017		2,000		$	3.65		2.78

Summary of Common Stock Reserved for Future Issuance

Common stock reserved for future issuance consists of the following (in thousands), as adjusted for the 1-for-12 reverse stock split:

	December 31, 2017
Stock options outstanding		3,156
Unvested restricted stock award		2,000
Employee stock purchase plan		411
Series A convertible preferred stock		2,659
Warrants outstanding		9,570
Authorized for future grant under the Plans		478
		18,274