Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Stock-Based Compensation

Schedule of stock-based compensation expense included in the consolidated statements of operations

	Year Ended December 31,
(In thousands)	2015		2014		2013
Research and development	$	1,036	$	2,781	$	573
General and administrative		5,837		12,980		7,325
Stock-based compensation from continuing operations		6,873		15,761		7,898
Stock-based compensation from discontinued operations		—		11,629		17,789
Total stock-based compensation expense	$	6,873	$	27,390	$	25,687

Schedule of stock-based compensation expense by award type

	Year Ended December 31,
(In thousands)	2015		2014		2013
Stock options	$	789	$	4,658	$	4,132
RSUs		2,492		4,564		10,174
RSAs		2,850		7,575		9,723
Performance RSUs		—		3		61
Performance RSAs		613		10,580		1,061
ESPP		129		10		536
Total stock-based compensation expense	$	6,873	$	27,390	$	25,687

Schedule of unrecognized stock-based compensation cost, net of expected forfeitures for awards expected to vest, including performance-contingent RSAs for which the performance milestones were determined to be probable of achievement, and the estimated weighted-average amortization period, using the straight-line attribution method

(In thousands, except amortization period)	Unrecognized Compensation Cost		Weighted- Average Amortization Period (Years)
Stock options	$	1,531		2.4
RSUs		1,446		1.1
RSAs		8,275		3.1
Performance RSAs		6		2.1
Total stock-based compensation expense	$	11,258

Summary of equity award activity under the 2012 plan and prior plans

(In thousands)	Number of Shares Subject to Outstanding Options			Weighted- Average Exercise Price of Outstanding Options		Number of Shares Subject to Outstanding RSUs			Weighted- Average Fair Value per Share at Grant		Number of Shares Outstanding Subject to Vesting or Performance Conditions with Vesting			Weighted- Average Fair Value per Share at Grant
Balance as of December 31, 2014		5,422			22.46		775			18.53		1,772			25.78
Granted		—			—		141			15.50		437			13.76
Exercised		(111	)		13.75		—			—		—			—
Released RSUs/RSAs		—			—		(327	)		17.66		(883	)		25.22
Forfeited		(1,049	)		21.19		(130	)		18.07		(21	)		20.33
Balance as of December 31, 2015		4,262		$	23.00		459		$	18.34		1,305		$	18.00

Schedule of weighted-average assumptions used to estimate the fair value of stock options granted and employee stock purchase plan issuances

	Year Ended December 31,
	2015(1)			2014	2013
Employee stock options
Risk-free interest rate		—	%	1.6% - 2.1%	0.8% - 2.0%
Expected term (in years)		—		5 - 6	5 - 6
Volatility		—	%	52% - 60%	58% - 60%
Dividend yield		—	%	3% - 4%	—
Weighted-average estimated fair value of stock options granted	$	—		$15.63	$19.96

(1)           There were no stock options granted for the year ended December 31, 2015.

	Year Ended December 31,
	2015	2014	2013
Employee stock purchase plan issuances
Risk-free interest rate	0.1% - 0.9%	0.1% - 0.5%	0.1% - 0.3%
Expected term (in years)	0.5 - 2	0.5 - 2	0.5 - 2
Volatility	44% - 69%	43% - 55%	56% - 61%
Dividend yield	0% - 6%	8%	—
Weighted-average estimated fair value of ESPP shares granted	$4.52	$4.49	$16.44