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Stockholders' Equity And Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity And Stock-Based Compensation [Abstract]

Stock Option Activity


			Number of Options		Weighted Average Exercise Price			Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
								In years		In millions
	Outstanding as of December 31, 2015		18,515,254		$	3.75		5.1		$	—
	Granted		355,000		$	2.36
	Exercised		—		$	—
	Canceled		(1,825,767)		$	4.87
	Outstanding as of December 31, 2016		17,044,487		$	3.60		4.8		$	—
	Vested and expected to vest at December 31, 2016		17,044,487		$	3.60		4.8		$	—
	Exercisable at December 31, 2016		13,430,734		$	3.89		3.8		$	—




Information About Stock Options Outstanding


							Options outstanding							Options exercisable
									Weighted
									average		Weighted					Weighted
							Number of		remaining		average			Number of		average
	Range of exercise prices						outstanding		contractual		exercise			vested		exercise
	From			To			options		life (in years)		price			options		price
	$	1.72		$	1.87		3,580,000		8.4		$	1.81		1,384,165		$	1.79
	$	2.03		$	2.58		3,454,819		5.1		$	2.45		2,767,527		$	2.48
	$	2.69		$	4.39		4,791,636		3.2		$	3.69		4,717,469		$	3.70
	$	4.59		$	5.00		3,735,079		3.5		$	4.87		3,111,329		$	4.86
	$	5.20		$	7.65		1,482,953		3.5		$	7.12		1,450,244		$	7.16
							17,044,487		4.8		$	3.60		13,430,734		$	3.89




Weighted Average Fair Value Of Options Granted


		2016		2015		2014
	Volatility	72%		74% to 76%		68% to 74%
	Risk-free interest rates	1% to 2%		1% to 2%		1% to 2%
	Expected life of option	7 years		7 years		7 years
	Dividend yield	zero		zero		zero
	Forfeiture rate	zero		zero		zero
	Weighted average fair value of stock options granted	$1.60		$1.29		$2.32




Performance Award activity


		Number of Performance Awards
Outstanding as of December 31, 2015		1,889,465
Granted		150,000
Vested Performance Awards		(485,000)
Canceled		—
Outstanding as of December 31, 2016		1,554,465




Summary Of Non-Cash Stock-Based Compensation



	Years ended December 31,
	2016			2015			2014

Research and development
Vesting of stock options	$	1,313		$	1,198		$	1,624
Vesting of Performance Awards		438			—			—
		1,751			1,198			1,624
General and administrative
Vesting of stock options		2,179			2,259			2,137
Vesting of Performance Awards		404			—			—
		2,583			2,259			2,137
Total non-cash stock-based compensation expenses
Vesting of stock options		3,492			3,457			3,761
Vesting of Performance Awards		842			—			—
	$	4,334		$	3,457		$	3,761




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