Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Gain (Loss)	Treasury Stock
Balance, value at Dec. 31, 2011	$ 297,568	$ 480	$ 1,087,033	$ (789,621)	$ 21	$ (345)
Balance, shares at Dec. 31, 2011		480,389,000
Stock-based compensation	6,495	0	6,495	0	0	0
Issuance of common stock to designees of Symphony Icon Holdings LLC, shares		13,238,000
Issuance of common stock to designees of Symphony Icon Holdings LLC, value	35,000	13	34,987	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		1,248,000
Issuance of common stock under Equity Incentive Plans, value	1,054	1	1,053	0	0	0
Issuance of common stock, net of fees, shares		17,500,000
Issuance of common stock, net of fees, value	37,055	18	37,037	0	0	0
Repurchase of common stock	(285)	0	0	0	0	(285)
Net loss	(110,211)	0	0	(110,211)	0	0
Unrealized gain (loss) on investments	2	0	0	0	2	0
Balance, value at Dec. 31, 2012	266,678	512	1,166,605	(899,832)	23	(630)
Balance, shares at Dec. 31, 2012		512,375,000
Stock-based compensation	7,421	0	7,421	0	0	0
Issuance of common stock to designees of Symphony Icon Holdings LLC, value	0
Issuance of common stock under Equity Incentive Plans, shares		1,974,000
Issuance of common stock under Equity Incentive Plans, value	1,084	2	1,082	0	0	0
Repurchase of common stock	(873)	0	0	0	0	(873)
Net loss	(104,126)	0	0	(104,126)	0	0
Unrealized gain (loss) on investments	(21)	0	0	0	(21)	0
Balance, value at Dec. 31, 2013	170,163	514	1,175,108	(1,003,958)	2	(1,503)
Balance, shares at Dec. 31, 2013		514,349,000
Stock-based compensation	7,081	0	7,081	0	0	0
Issuance of common stock to designees of Symphony Icon Holdings LLC, shares		4,663,000
Issuance of common stock to designees of Symphony Icon Holdings LLC, value	5,750	5	5,745	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		1,766,000
Issuance of common stock under Equity Incentive Plans, value	323	2	321	0	0	0
Issuance of common stock, net of fees, shares		204,863,000
Issuance of common stock, net of fees, value	201,947	205	201,742	0	0	0
Repurchase of common stock	(887)	0	0	0	0	(887)
Net loss	(100,294)	0	0	(100,294)	0	0
Unrealized gain (loss) on investments	(65)	0	0	0	(65)	0
Balance, value at Dec. 31, 2014	$ 284,018	$ 726	$ 1,389,997	$ (1,104,252)	$ (63)	$ (2,390)
Balance, shares at Dec. 31, 2014		725,641,000