Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Assumptions Used to Compute Share-Based Compensation Costs for Stock Options Granted

The assumptions used to compute the share-based compensation costs for the stock options granted during the year ended December 31, 2018, using the Black-Scholes option pricing model, were as follows:

Weighted average grant date fair value of    stock options	$	1.56
Assumptions
Risk-free interest rate (weighted average)		2.90	%
Expected dividend yield		—
Weighted average expected life (years)		6.2
Volatility (weighted average)		73.8	%
Forfeiture rate		26.6	%

Assumptions Used Estimate Fair Value of Employee Stock Purchase Plans

Following is a schedule of the shares purchased, the fair value per share, and the Black-Scholes model assumptions for each offering period:

	September30,			March 31,			September30,			March 31,
Offering Period Ended	2018			2018			2017			2017
Shares purchased for offering    period		1,843			3,250			2,000			2,002
Fair value per share	$	0.96		$	0.75		$	0.35		$	0.72
Assumptions
Risk-free interest rate (average)		2.29	%		1.92	%		0.89	%		0.47	%
Expected dividend yield		—			—			—			—
Weighted average expected life    (years)		0.5			0.5			0.5			0.5
Volatility (average)		54.3	%		81.4	%		64.2	%		52.6	%

Non-Cash Stock-Based Compensation Expenses

Non-cash stock-based compensation expenses related to stock options, restricted stock grants and the ESPP were recorded in the financial statements as follows (in thousands):

	Year Ended December 31,
	2018		2017
Cost of revenues	$	—	$	1
Selling and marketing		112		(23	)
Research and development		207		213
General and administrative		616		582
Restructuring expense		—		398
Total non-cash stock compensation expense	$	935	$	1,171

Summary of Outstanding Stock Options and Related Activity

A summary of the Company’s stock options outstanding under the 2015 OEIP and 2005 Plan as of December 31, 2018 and the activity during the years ended herein are as follows (in thousands except per share amounts):

				Weighted Ave.		Aggregate
	Shares			Exercise Price		Intrinsic Value
Outstanding as of December 31, 2016		373		$	22.51	$	—
(307 options exercisable at a weighted average    exercise price of $26.48)
Granted		—		$	—
Exercised		—		$	—
Canceled / expired		(234	)	$	32.54
Outstanding as of December 31, 2017		139		$	5.69	$	—
(116 options exercisable at a weighted average    exercise price of $6.16)
Granted		30		$	—
Exercised		—		$	—
Canceled / expired		(9	)
Outstanding as of December 31, 2018		160		$	4.88	$	—
Exercisable as of December 31, 2018		123		$	5.64	$	—
Vested and expected to vest at December 31, 2018		136		$	4.13	$	—

Summary of Outstanding Restricted Stock Awards and Related Activity

A summary of the Company’s restricted stock awards outstanding under the 2015 OEIP and 2005 Plan as of December 31, 2018, and the activity during years ended therein, are as follows (in thousands):

				Weightedaverage
	Number					grant date
	of shares					fair value
Unvested at December 31, 2016		434		$	4.30
Granted		88			1.11
Vested		(329	)		3.98
Canceled and forfeited		(26	)		2.70
Unvested at December 31, 2017		167			3.49
Granted		1,125			1.92
Vested		(283	)		2.52
Canceled and forfeited		(2	)		0.83
Unvested at December 31, 2018		1,007			2.01