Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

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

	Three Months Ended September 30,		Nine Months Ended September 30,
Employee stock options:	2015	2014	2015	2014
Risk-free interest rate	1.4%	1.3% - 1.7%	0.6% – 1.7%	1.3% – 1.7%
Volatility	59.3%	53.7% – 55.6%	55.7% – 59.3%	53.7% – 57.5%
Expected life (years)	4.0	4.0-5.0	4.0-5.0	4.0-5.0
Dividend yield	0%	0%	0%	0%

Summary of option and RSU activity under Amended and Restated 2000 Stock Option and Equity Incentive Plan and Amended and Restated 2010 Equity Incentive Plan

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
Additional shares authorized under the Amended 2010 Plan	—		—		—
Restricted stock units cancelled	10		—		—
Options granted	(95	)	95		$	2.04
Options cancelled	128		(128	)	$	4.00
Options exercised	—		(40	)	$	1.65
Options expired	(15	)	—		$	4.35

Balance at June 30, 2015	1,046		7,069		$	3.50
Additional shares authorized under the Amended 2010 Plan	—		—		—
Restricted stock units cancelled	4		—		—
Options granted	(120	)	120		$	1.70
Options cancelled	203		(203	)	$	2.90
Options exercised	—		(20	)	$	1.65
Options expired	(121	)	—		$	2.26
Balance at September 30, 2015	1,012		6,966		$	3.49

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
Granted	—		—
Cancelled	(2	)	$	3.86
Exercised	(512	)	$	1.55
Expired	(16	)	$	1.55

Balance at June 30, 2015	1,703		$	4.34
Granted	—		—
Cancelled	(28	)	$	3.57
Exercised	(6	)	$	1.50
Expired	—		$	—

Balance at September 30, 2015	1,669		$	4.36

Summary of RSU activity under the Plans

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
Vested	(3	)	$	4.46
Cancelled	(10	)	$	4.62

Non-vested shares at June 30, 2015	255		$	4.60
Vested	(8	)	$	4.46
Cancelled	(4	)	$	4.62

Non-vested shares at September 30, 2015	243		$	4.76

Summary of significant ranges of outstanding and exercisable options

The following table summarizes significant ranges of outstanding and exercisable options as of September 30, 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
$1.68 - $2.24	1,612	9.19	$	2.01	261	$	2.05
$2.25 - $3.15	1,429	2.94	$	2.97	1,196	$	2.96
$3.16 - $3.80	1,483	2.90	$	3.42	1,239	$	3.43
$3.81 - $4.34	1,435	3.33	$	3.96	1,222	$	3.96
$4.35 - $4.69	1,386	5.58	$	4.47	974	$	4.46
$4.70 - $6.11	1,290	2.01	$	5.56	1,217	$	5.57

$1.68 - $6.11	8,635	4.45	$	3.66	6,109	$	3.98	$	—

Vested and expected to vest	8,415	4.35	$	3.69				$	—

Exercisable	6,109	3.13	$	3.98				$	—