Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Schedule of assumptions used in estimation of fair value of the share-based payment awards on the grant date

	Three Months Ended March 31,
Employee stock options:	2015	2014
Risk-free interest rate	0.6% - 1.4%	1.5% - 1.7%
Volatility	55.8% - 57.7%	56.9% - 57.5%
Expected life (years)	3.0-5.0	4.0-5.0
Dividend yield	0%	0%

Summary of activity under the Plans

A summary of the option and RSU activity under the Company’s Amended and Restated 2000 Stock Option and Equity Incentive Plan (Amended 2000 Plan) and Amended and Restated 2010 Equity Incentive Plan (Amended 2010 Plan), referred to collectively as the “Plans,” is presented below (in thousands, except exercise price):

			Options Outstanding
	Available for Grant		Number of Shares		Weighted Average Exercise Prices
Balance at December 31, 2014	1,760		5,994		$	3.87
Additional shares authorized under the Amended 2010 Plan	500		—		—
Restricted stock units cancelled	6		—		—
Options granted	(1,323	)	1,323		$	2.05
Options cancelled	153		(153	)	$	5.00
Options exercised	—		(22	)	$	1.60
Options expired	(78	)	—		5.79
Balance at March 31, 2015	1,018		7,142		$	3.52

Summary of the inducement grant option activity

A summary of the inducement grant option activity is presented below (in thousands, except exercise price):

	Options Outstanding
	Number of Shares	Weighted Average Exercise Prices
Balance at December 31, 2014 and March 31, 2015	2,233	$	3.68

Summary of restricted stock unit activity

A summary of RSU activity under the Plans is presented below (in thousands, except for fair value):

	Number of Shares		Weighted Average Grant-Date Fair Value
Non-vested shares at December 31, 2014	394		$	4.61
Vested	(120	)	$	4.60
Cancelled	(6	)	$	4.60
Non-vested shares at March 31, 2015	268		$	4.61

Summary of significant ranges of outstanding and exercisable options

The following table summarizes significant ranges of outstanding and exercisable options as of March 31, 2015 (in thousands, except contractual life and exercise price):

	Options Outstanding				Options Exercisable
Range of Exercise Price	Number Outstanding	Weighted Average Remaining Contractual Life (in Years)	Weighted Average Exercise Price		Number Exercisable	Weighted Average Exercise Price		Aggregate Intrinsic Value
$1.50 - $2.94	2,542	5.97	$	2.06	1,098	$	2.01
$2.95 - $3.58	2,353	3.85	$	3.23	1,502	$	3.25
$3.59 - $4.46	3,013	4.77	$	4.15	2,131	$	4.12
$4.47 - $6.50	1,467	2.77	$	5.44	1,286	$	5.49
$1.50 - $6.50	9,375	4.55	$	3.56	6,017	$	3.81	$	418
Vested and expected to vest	9,027	4.40	$	3.58				$	405
Exercisable	6,017	2.88	$	3.81				$	331