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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Stock-Based Compensation

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

		Year Ended December 31,
Employee stock options:		2013			2012			2011
Risk-free interest rate			0.5% -  1.7	%		0.2% -  0.8	%		0.2% -  1.7	%
Volatility			57.7% - 62.9	%		59.5% - 73.1	%		40.7% - 65.4	%
Expected life (years)			4.0-5.0			4.0			4.0
Dividend yield			0	%		0	%		0	%

Summary of activity under the Plans

A summary of activity under the Plans is presented below (in thousands, except exercise price):

		Shares Available for Grant			Number of Options outstanding			Weighted Average Exercise Prices
Balance at December 31, 2010			3,650			5,594		$	4.64
Additional authorized under the 2010 Plan			500			—			—
Options granted			(2,201	)		2,201		$	4.13
Options cancelled			743			(743	)	$	5.41
Options exercised			—			(524	)	$	3.34
Options expired			(715	)		—		$	5.41
​	​	​	​	​	​	​	​	​	​	​
Balance at December 31, 2011			1,977			6,528		$	4.48
Additional authorized under the 2010 Plan			500			—			—
Options granted			(1,827	)		1,827		$	3.19
Options cancelled			1,217			(1,217	)	$	5.42
Options exercised			—			(266	)	$	2.38
Options expired			(602	)		—		$	6.89
​	​	​	​	​	​	​	​	​	​	​
Balance at December 31, 2012			1,265			6,872		$	4.05
Additional authorized under the 2010 Plan			500			—			—
Restricted stock units granted			(35	)		—			—
Options granted			(1,543	)		1,543		$	4.27
Options cancelled			1,123			(1,123	)	$	6.00
Options exercised			—			(565	)	$	3.05
Options expired			(888	)		—		$	6.49
​	​	​	​	​	​	​	​	​	​	​
Balance at December 31, 2013			422			6,727		$	3.86
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

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, 2010			4,812		$	2.92
Granted			400		$	6.06
Cancelled			(48	)	$	1.54
Exercised			(349	)	$	1.55
​	​	​	​	​	​	​	​
Balance at December 31, 2011			4,815		$	3.29
Granted			350		$	3.92
Cancelled			(550	)	$	1.55
Exercised			(1,257	)	$	1.55
​	​	​	​	​	​	​	​
Balance at December 31, 2012			3,358		$	4.29
Granted			347		$	3.94
Cancelled			(7	)	$	3.45
Exercised			(520	)	$	3.28
​	​	​	​	​	​	​	​
Balance at December 31, 2013			3,178		$	4.42
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Summary of restricted stock unit activity

A summary of restricted stock unit activity is presented below (in thousands, except fair value):

		Number of Shares			Weighted Average Grant-Date Fair Value
Non-vested shares at December 31, 2009			46		$	1.60
Vested			(15	)	$	1.60
​	​	​	​	​	​	​	​
Non-vested shares at December 31, 2010			31		$	1.60
Vested			(16	)	$	1.60
​	​	​	​	​	​	​	​
Non-vested shares at December 31, 2011			15		$	1.60
Vested			(12	)	$	1.62
Cancelled			(3	)	$	1.55
​	​	​	​	​	​	​	​
Non-vested shares at December 31, 2012			—			—
Granted			35		$	4.46
Vested			(8	)	$	4.46
​	​	​	​	​	​	​	​
Non-vested shares at December 31, 2013			27		$	4.46
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Summary of significant ranges of outstanding and exercisable options

The following table summarizes significant ranges of outstanding and exercisable options as of December 31, 2013 (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			Aggregate Intrinsic value			Number Exercisable			Weighted Average Remaining Contractual Life (in Years)			Weighted Average Exercise Price			Aggregate Intrinsic value
$1.50 - $3.23			2,846			3.28		$	2.59		$	8,330			1,807			2.63		$	2.30		$	5,814
$3.24 - $4.19			2,521			4.34		$	3.77		$	4,413			1,355			3.72		$	3.76		$	2,387
$4.20 - $5.61			3,621			3.93		$	4.88		$	2,422			2,493			1.95		$	5.07		$	1,240
$5.62 - $6.50			917			2.94		$	5.98			—			672			2.80		$	5.98			—
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
			9,905			3.76		$	4.04		$	15,165			6,327			2.61		$	4.09		$	9,441
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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