Stock Benefit Plans and Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

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):

	Shares			Weighted average exercise price		Weighted average remaining contractual term (in years)		Aggregate intrinsic value
Outstanding at December 31, 2017		3,156		$	4.31		8.28	$	1,841
Granted		2,298		$	2.88
Exercised		(14	)	$	1.81
Forfeited		(758	)	$	4.12
Outstanding at December 31, 2018		4,682		$	3.64		8.46	$	919
Options vested and exercisable at December 31, 2018		1,249		$	6.34		6.77	$	341
Options vested and expected to vest at December 31, 2018		4,230		$	3.73		8.40	$	861

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):

	Shares			Weighted average grant date fair value		Weighted average remaining recognition period (in years)
Unvested at December 31, 2017		2,000		$	3.41		2.78
Awarded		1,924		$	2.87
Vested		(278	)	$	4.00
Forfeited		(376	)	$	4.31
Unvested at December 31, 2018		3,270		$	2.94		2.55

Summary of Common Stock Reserved for Future Issuance

Common stock reserved for future issuance consists of the following (in thousands):

	December 31, 2018
Stock options outstanding		4,682
Unvested restricted stock awards		3,270
Employee stock purchase plan		226
Series A convertible preferred stock		2,022
Convertible notes		988
Warrants outstanding		22,302
Distributor and Development Services plans		4,000
Merger contingently issuable		887
Authorized for future grant under the Plans		1,061
		39,438