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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Activity Under Equity Incentive Plans Related to Stock Options

Activity under the Company’s equity incentive plans related to stock options is set forth below (in thousands except weighted average exercise price):

		Number of Options Outstanding				Weighted Average Exercise Price per Share
Balances at December 31, 2010			7,007			$	6.42
Granted			2,169				2.36
Forfeited			(465	)			2.45
Expired			(1,237	)			11.52
Exercised			(112	)			0.81
Balances at December 31, 2011			7,362			$	4.70
Granted			1,782				3.68
Forfeited			(98	)			2.78
Expired			(386	)			30.44
Exercised			(156	)			1.30
Balances at December 31, 2012			8,504			$	3.40
Granted			2,621				3.82
Forfeited			(234	)			3.13
Expired			(189	)			6.71
Exercised			(297	)			3.14
Balances at December 31, 2013			10,405			$	3.46

Information Regarding Stock Options Outstanding Stock Options Vested and Expected to Vest and Stock Options Exercisable

Information regarding the Company’s stock options outstanding, stock options vested and expected to vest, and stock options exercisable at December 31, 2013 was as follows (in thousands except weighted average exercise price and contractual term):

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value
Balances at December 31, 2013
Stock options outstanding			10,405			$	3.46				6.34			$	32,724
Stock options vested and expected to vest			10,028			$	3.45				6.25			$	31,730
Stock options exercisable			6,589			$	3.43				5.05			$	21,555

Activity Under Equity Incentive Plans Related to Restricted Stock Units

Activity under the Company’s equity incentive plans related to restricted stock units is set forth below:

		Number of RSUs				Weighted Average Grant-Date Fair Value
Balances at December 31, 2010			88,400			$	2.54
Granted			—				0.00
Forfeited			(17,727	)			1.85
Vested			(37,378	)			3.48
Balances at December 31, 2011			33,295			$	1.85
Granted			2,000				3.03
Forfeited			—				0.00
Vested			(18,650	)			1.98
Balances at December 31, 2012			16,645			$	1.85
Granted			—				0.00
Forfeited			—				0.00
Vested			(16,645	)			1.85
Balances at December 31, 2013			—			$	—

Recognition of Stock-Based Compensation Expense

Stock-based compensation expense recognized on the Company’s consolidated statements of operations for the years ended December 31, 2013, 2012 and 2011, was as follows (in thousands):

		Year Ended December 31,
		2013				2012				2011
Stock-based compensation expense by caption:
Research and development		$	482			$	554			$	450
Selling, general and administrative			2,786				1,987				1,400
Total stock-based compensation expense		$	3,268			$	2,541			$	1,850

Weighted Average Assumptions Used to Value Stock-Based Awards

The weighted average assumptions used to value the Company’s stock-based awards for the years ended December 31, 2013, 2012 and 2011, was as follows:

		Year Ended December 31,
		2013				2012				2011
Stock Options:
Expected term (in years)			5.59				5.54				5.30
Estimated volatility			60	%			67	%			68	%
Risk-free interest rate			0.87	%			1.03	%			1.23	%
Expected dividend yield			0	%			0	%			0	%
Employee Stock Purchase Plan Rights:
Expected term (in years)			0.50				0.50				0.50
Estimated volatility			39	%			101	%			48	%
Risk-free interest rate			0.10	%			0.14	%			0.08	%
Expected dividend yield			0	%			0	%			0	%

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- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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