CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Gain (Loss)
Balance at Dec. 31, 2010	$ 334,783	$ 103	$ 911,632	$ (576,590)	$ (362)
Balance (in shares) at Dec. 31, 2010		102,676
Increase (Decrease) in Stockholders' Equity
Net loss	(43,053)	0	0	(43,053)	0
Unrealized gain (loss) on marketable securities, net of tax	(27)	0	0	0	(27)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan	10,094	1	10,093	0	0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)		1,371
Net issuance of common stock due to CRI acquisition	86,143	6	86,137	0	0
Net issuance of common stock due to CRI acquisition (in shares)		6,220
Settlement of Samsung’s option related to the contingently redeemable common stock	13,500	0	13,500	0	0
Stock-based compensation	28,354	0	28,354	0	0
Balance at Dec. 31, 2011	429,794	110	1,049,716	(619,643)	(389)
Balance (in shares) at Dec. 31, 2011		110,267
Increase (Decrease) in Stockholders' Equity
Net loss	(134,336)	0	0	(134,336)	0
Unrealized gain (loss) on marketable securities, net of tax	89	0	0	0	89
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan	3,501	2	3,499	0	0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)		1,258
Stock-based compensation	22,546	0	22,546	0	0
Balance at Dec. 31, 2012	321,594	112	1,075,761	(753,979)	(300)
Balance (in shares) at Dec. 31, 2012		111,525
Increase (Decrease) in Stockholders' Equity
Net loss	(33,748)	0	0	(33,748)
Unrealized gain (loss) on marketable securities, net of tax	(5)	0	0	0	(5)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan	7,865	1	7,864	0	0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)		1,934
Stock-based compensation	14,981	0	14,981	0	0
Equity component of 1.125% convertible senior notes due 2018	29,542	0	29,542	0	0
Balance at Dec. 31, 2013	$ 340,229	$ 113	$ 1,128,148	$ (787,727)	$ (305)
Balance (in shares) at Dec. 31, 2013		113,459