Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Fair Value of Each Stock Option Granted Weighted-Average Assumptions

The fair value of each stock option granted was estimated using the following weighted-average assumptions:

	Year Ended December 31, 2013			Year Ended December 31, 2012			Year Ended December 31, 2011
Fair value of options granted	$	1.69		$	1.26		$	1.33
Expected volatility		91	%		89	%		78	%
Risk-free interest rate		1.3	%		1.5	%		2.2	%
Expected lives		7.0 years			7.0 years			7.0 years
Dividend rate		—			—			—

Summary of Stock Option Activity

The following is a summary of stock option activity: (in thousands, except exercise price data and contractual life data):

						Weighted-
				Weighted-		Average
	Number			Average		Remaining		Aggregate
	of			Exercise		Contractual		Intrinsic
Options	Shares			Price		Life (Years)		Value
Outstanding at December 31, 2010		7,856		$	7.12
Granted		260		$	2.03
Exercised		(25	)		1.73			$	14
Forfeited or cancelled		(886	)		9.39
Outstanding at December 31, 2011		7,205		$	6.68
Granted		2,592		$	1.64
Exercised		(50	)		0.46			$	45
Forfeited or cancelled		(1,540	)		9.72
Outstanding at December 31, 2012		8,207		$	4.55
Granted		2,815		$	2.18
Exercised		(1,683	)		1.67			$	4,965
Forfeited or cancelled		(1,622	)		5.70
Outstanding at December 31, 2013		7,717		$	4.05		6.08	$	22,023
Exercisable at December 31, 2013		3,611		$	6.38		2.96	$	5,346
Expected to Vest at December 31, 2013		4,106		$	2.01		8.86	$	16,744

Summary of Nonvested Restricted Stock and Restricted Stock Units Activity

The following is a summary of nonvested restricted stock and restricted stock units activity: (in thousands, except grant date fair value data):

	Number of Shares			Weighted- Average Grant Date Fair Value
Nonvested balance at December 31, 2010		1,441		$	4.43
Granted		1,003			1.78
Vested		(512	)		5.28
Forfeited or cancelled		(22	)		3.69
Nonvested balance at December 31, 2011		1,910		$	2.81
Vested		(840	)		3.37
Forfeited or cancelled		(55	)		1.97
Nonvested balance at December 31, 2012		1,015		$	2.43
Vested		(487	)		2.16
Forfeited or cancelled		(34	)		1.78
Nonvested balance at December 31, 2013		494		$	2.73